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1.3.5.3.md

Connect Request [1]

Client -> Server

Size Description Type Notes
? Version String "Terraria" + Main.curRelease

Disconnect [2]

Server -> Client

Size Description Type Notes
? Reason NetworkText -

Set User Slot [3]

Server -> Client

Size Description Type Notes
1 Player ID Byte -

Player Info [4]

Server <-> Client (Sync)

Size Description Type Notes
1 Player ID Byte -
1 Skin Varient Byte -
1 Hair Byte If >134 then Set To 0
? Name String -
1 Hair Dye Byte -
1 Hide Visuals Byte -
1 Hide Visuals 2 Byte -
1 Hide Misc Byte -
3 Hair Color Color -
3 Skin Color Color -
3 Eye Color Color -
3 Shirt Color Color -
3 Under Shirt Color Color -
3 Pants Color Color -
3 Shoe Color Color -
1 Difficulty Byte -

Player Inventory Slot [5]

Server <-> Client (Sync)

Size Description Type Notes
1 Player ID Byte -
1 Slot ID Byte 0 - 58 = Inventory, 59 - 78 = Armor, 79 - 88 = Dye, 89 - 93 MiscEquips, 94 - 98 = MiscDyes, 99 - 138 = Piggy bank, 139-178 = Safe, 179 = Trash
2 Stack Int16 -
1 Prefix Byte -
2 Item NetID Int16 -

Request World Data [6]

Client -> Server

Size Description Type Notes

World Info [7]

Server -> Client

Size Description Type Notes
4 Time Int32 -
1 Day and Moon Info Byte BitFlags: 1 = Day Time, 2 = Blood Moon, 4 = Eclipse
1 Moon Phase Byte -
2 MaxTilesX Int16 -
2 MaxTilesY Int16 -
2 SpawnX Int16 -
2 SpawnY Int16 -
2 WorldSurface Int16 -
2 RockLayer Int16 -
4 WorldID Int32 -
? World Name String -
16 World Unique ID Byte[] -
8 World Generator Version UInt64 -
1 Moon Type Byte -
1 Tree Background Byte -
1 Corruption Background Byte -
1 Jungle Background Byte -
1 Snow Background Byte -
1 Hallow Background Byte -
1 Crimson Background Byte -
1 Desert Background Byte -
1 Ocean Background Byte -
1 Ice Back Style Byte -
1 Jungle Back Style Byte -
1 Hell Back Style Byte -
4 Wind Speed Set Single -
1 Cloud Number Byte -
4 Tree 1 Int32 -
4 Tree 2 Int32 -
4 Tree 3 Int32 -
1 Tree Style 1 Byte -
1 Tree Style 2 Byte -
1 Tree Style 3 Byte -
1 Tree Style 4 Byte -
4 Cave Back 1 Int32 -
4 Cave Back 2 Int32 -
4 Cave Back 3 Int32 -
1 Cave Back Style 1 Byte -
1 Cave Back Style 2 Byte -
1 Cave Back Style 3 Byte -
1 Cave Back Style 4 Byte -
4 Rain Single -
1 Event Info Byte BitFlags: 1 = Shadow Orb Smashed, 2 = Downed Boss 1, 4 = Downed Boss 2, 8 = Downed Boss 3, 16 = Hard Mode, 32 = Downed Clown, 64 = Server Side Character, 128 = Downed Plant Boss
1 Event Info 2 Byte BitFlags: 1 = Mech Boss Downed, 2 = Mech Boss Downed 2, 4 = Mech Boss Downed 3, 8 = Mech Boss Any Downed, 16 = Cloud BG, 32 = Crimson, 64 = Pumpkin Moon, 128 = Snow Moon
1 Event Info 3 Byte BitFlags: 1 = Expert Mode, 2 = FastForwardTime, 3 = Slime Rain, 4 = Downed Slime King, 5 = Downed Queen Bee, 6 = Downed Fishron, 7 = Downed Martians, 8 = Downed Ancient Cultist
1 Event Info 4 Byte BitFlags: 1 = Downed Moon Lord, 2 = Downed Pumking, 3 = Downed Mourning Wood, 4 = Downed Ice Queen, 5 = Downed Santank, 6 = Downed Everscream, 7 = Downed Golem, 8 = Birthday Party
1 Event Info 5 Byte BitFlags: 1 = Downed Pirates, 2 = Downed Frost Legion, 3 = Downed Goblins, 4 = Sandstorm, 5 = DD2 Event, 6 = Downed DD2 Tier 1, 7 = Downed DD2 Tier 2, 8 = Downed DD2 Tier 3
1 Invasion Type SByte -
8 Lobby ID UInt64 -
4 Sandstorm Severity Single -

Request Essential Tiles [8]

This packet is used once in the connecting phase and does the following:

  1. Sends you the spawn sections
  2. Optionally, if spawn coords aren't -1 - sends you the sections of the selected position (which is the player's spawnpoint)
  3. Synchronises all portals and sections around them

Client -> Server

Size Description Type Notes
4 X Int32 Player Spawn X
4 Y Int32 Player Spawn Y

Status [9]

Server -> Client

Size Description Type Notes
4 StatusMax Int32 Status only increases
? Status Text NetworkText -

Send Section [10]

Server -> Client

Size Description Type Notes
1 Compressed Boolean -
4 X Start Int32 -
4 Y Start Int32 -
2 Width Int16 -
2 Height Int16 -
? Tiles -
2 Chest Count Int16 -
? Chests -
2 Sign Count Int16 -
? Signs -
2 TileEntity Count Int16 -
? TileEntities - -

Section Tile Frame [11]

Server -> Client

Size Description Type Notes
2 StartX Int16 -
2 StartY Int16 -
2 EndX Int16 -
2 EndY Int16 -

Spawn Player [12]

Client -> Server

Size Description Type Notes
1 Player ID Byte -
2 SpawnX Int16 -
2 SpawnY Int16 -

Update Player [13]

Server <-> Client (Sync)

Size Description Type Notes
1 Player ID Byte -
1 Control Byte BitFlags: ControlUp = 1, ControlDown = 2, ControlLeft = 4, ControlRight = 8, ControlJump = 16, ControlUseItem = 32, Direction = 64
1 Pulley Byte BitFlags: 0 = None, 1 = Direction, 2 = Direction, 4 = Update Velocity, 8 = Vortex Stealth Active, 16 = Gravity Direction, 32 = Shield Raised
1 SelectedItem Byte -
4 PositionX Single -
4 PositionY Single -
4 VelocityX Single Not sent if Update Velocity is not set
4 VelocityY Single Not sent if Update Velocity is not set

Player Active [14]

Server -> Client

Size Description Type Notes
1 Player ID Byte -
1 Active Boolean -

Null [15]

Never sent

Size Description Type Notes

Player HP [16]

Server <-> Client (Sync)

Size Description Type Notes
1 Player ID Byte -
2 HP Int16 -
2 Max HP Int16 -

Modify Tile [17]

Server <-> Client (Sync)

Size Description Type Notes
1 Action Byte Values: 0 = KillTile, 1 = PlaceTile, 2 = KillWall, 3 = PlaceWall, 4 = KillTileNoItem, 5 = PlaceWire, 6 = KillWire, 7 = PoundTile, 8 = PlaceActuator, 9 = KillActuator, 10 = PlaceWire2, 11 = KillWire2, 12 = PlaceWire3, 13 = KillWire3, 14 = SlopeTile, 15 = FrameTrack, 16 = PlaceWire4, 17 = KillWire4, 18 = PokeLogicGate, 19 = Actuate
2 TileX Int16 -
2 TileY Int16 -
2 Var1 Int16 KillTile (Fail: Bool), PlaceTile (Type: Byte), KillWall (Fail: Bool), PlaceWall (Type: Byte), KillTileNoItem (Fail: Bool), SlopeTile (Slope: Byte)
1 Var2 Byte Var2: PlaceTile (Style: Byte)

Time [18]

Server -> Client

Size Description Type Notes
1 DayTime Boolean -
4 TimeValue Int32 -
2 SunModY Int16 -
2 MoonModY Int16 -

Door Toggle [19]

Server <-> Client (Sync)

Size Description Type Notes
1 Action Byte 0 = Open Door, 1 = Close Door, 2 = Open Trapdoor, 3 = Close Trapdoor, 4 = Open Tall Gate, 5 = Close Tall Gate
2 TileX Int16 -
2 TileY Int16 -
1 Direction Byte If (Action == 0) then (if (Direction == -1) then OpenToLeft else OpenToRight) if (Action == 2) then (if (Direction == 1) then PlayerIsAboveTrapdoor) if (Action == 3) then (if (Direction == 1) then PlayerIsAboveTrapdoor)

Send Tile Square [20]

Server <-> Client (Sync)

Size Description Type Notes
2 Player ID UInt16 -
1 TileChangeType Byte Only if != 0
2 Size Int16 -
2 TileX Int16 -
2 TileY Int16 -
? Tiles -

Update Item Drop [21]

Server <-> Client (Sync)

Size Description Type Notes
2 ItemID Int16 If below 400 and NetID 0 Then Set NullIf ItemID is 400 Then New Item
4 PositionX Single -
4 PositionY Single -
4 VelocityX Single -
4 VelocityY Single -
2 Stack Size Int16 -
1 Prefix Byte -
1 NoDelay Byte If 0 then ownIgnore = 0 and ownTime = 100
2 Item NetID Int16 -

Update Item Owner [22]

Server <-> Client (Sync)

Size Description Type Notes
2 ItemID Int16 -
1 Player ID Byte -

NPC Update [23]

Server -> Client

Size Description Type Notes
2 NPC ID Int16 -
4 PositionX Single -
4 PositionY Single -
4 VelocityX Single -
4 VelocityY Single -
2 Target UInt16 Player ID
1 Flags Byte BitFlags: 1 = Direction, 2 = DirectionY, 4 = AI[0], 8 = AI[1], 16 = AI[2], 32 = AI[3], 64 = SpriteDirection, 128 = LifeMax
? AI[?] Single[] Requires the AI flag to be set in order to be sent down the wire
2 NPC NetID Int16 -
1 LifeBytes Byte The size in bytes of Life, only present if !Flags[7] (LifeMax)
? Life Byte or Int16 or Int32 Only present if !Flags[7] (LifeMax)
1 ReleaseOwner Byte Only present if NPC is catchable

Strike NPCwith Held Item [24]

Server <-> Client (Sync)

Size Description Type Notes
2 NPC ID Int16 -
1 Player ID Byte -

Projectile Update [27]

Server <-> Client (Sync)

Size Description Type Notes
2 ProjectileID Int16 -
4 PositionX Single -
4 PositionY Single -
4 VelocityX Single -
4 VelocityY Single -
4 KnockBack Single -
2 Damage Int16 -
1 Owner Byte Player ID
2 Type Int16 -
1 AIFlags Byte BitFlags: 0 = AI[0] is Present, 1 = AI[1] is Present, 2 = Needs UUID
4 AI0 Single Requires the AI0 flag to be set in order to be sent down the wire
4 AI1 Single Requires the AI1 flag to be set in order to be sent down the wire
2 ProjUUID Int16 Requires the Needs UUID flag to be set in order to be sent down the wire

NPC Strike [28]

Server <-> Client (Sync)

Size Description Type Notes
2 NPC ID Int16 -
2 Damage Int16 -1 = Kill
4 Knockback Single -
1 Direction Byte -
1 Crit Boolean -

Destroy Projectile [29]

Server <-> Client (Sync)

Size Description Type Notes
2 Projectile ID Int16 -
1 Owner Byte Player ID

Toggle P V P [30]

Server <-> Client (Sync)

Size Description Type Notes
1 Player ID Byte -
1 PVP Enabled Boolean -

Open Chest [31]

Client -> Server

Size Description Type Notes
2 TileX Int16 -
2 TileY Int16 -

Packet [31] is always used to "open" a world chest (that is, an item container placed in the world). When this packet is received the server will send the chest's contents, and sync the active chest ID to the player using packet [33].

Update Chest Item [32]

Server <-> Client (Sync)

Size Description Type Notes
2 Chest ID Int16 -
1 ItemSlot Byte -
2 Stack Int16 -
1 Prefix Byte -
2 Item Net ID Int16 -

Sync Active Chest [33]

Server <-> Client (Sync)

Size Description Type Notes
2 Chest ID Int16 -
2 ChestX Int16 -
2 ChestY Int16 -
1 Name Length Byte -
? Chest Name String Only if length > 0 && <= 20

This packet is used to tell the server that you've exited the chest view (sending ID -1), that you're looking at your piggy bank (sending ID -2), that you're looking at your safe (sending ID -3) and that you're looking at your defender's forge (sending ID -4). Those are sent at every chest interaction. Packet [33]'s main function is to synchronize the sending client's active chest to the server, and its side function is to rename the chest. It should be noted that this packet is not sent when you open a regular chest. The server knows which chest you opened when you send [31], so the [33] is only sent upon exit to unblock the chest (as opposed to both open & exit for banks like piggy, safe & defender forge)

PlaceChest [34]

Server <-> Client

Size Description Type Notes
1 ChestID Byte BitFlags:0 = Place Chest, 1 = Kill Chest, 2 = Place Dresser, 3 = Kill Dresser. 4 = Place Containers2, 5 = Kill Containers2
2 TileX Int16 -
2 TileY Int16 -
2 Style Int16 FrameX(Chest type)
2 Chest ID to destroy Int16 ID if client is receiving packet, else 0

Heal Effect [35]

Server <-> Client (Sync)

Size Description Type Notes
1 Player ID Byte -
2 Heal Amount Int16 -

Player Zone [36]

Server <-> Client (Sync)

Size Description Type Notes
1 Player ID Byte -
1 Zone1 Byte 1 = Dungeon, 2 = Corruption, 4 =Holy, 8 = Meteor, 16 = Jungle, 32 = Snow, 64 = Crimson, 128 = Water Candle
1 Zone2 Byte 1 = Peace Candle, 2 = Solar Tower, 4 = Vortex Tower, 8 = Nebula Tower, 16 = Stardust Tower, 32 = Desert, 64 = Glowshroom, 128 = Underground Desert
1 Zone3 Byte 1 = Overworld, 2 = Dirt Layer, 4 = Rock Layer, 8 = Underworld, 16 = Beach, 32 = Rain, 64 = Sandstorm
1 Zone4 Byte 1 = Old One's Army

Request Password [37]

Server -> Client

Size Description Type Notes

Send Password [38]

Client -> Server

Size Description Type Notes
? Password String -

Remove Item Owner [39]

Server -> Client

Size Description Type Notes
2 ItemIndex Int16 -

Set Active NPC [40]

Server <-> Client (Sync)

Size Description Type Notes
1 Player ID Byte -
2 Npc Talk Target Int16 -

Player Item Animation [41]

Server <-> Client (Sync)

Size Description Type Notes
1 Player ID Byte -
4 Item Rotation Single -
2 Item Animation Int16 -

Player Mana [42]

Server <-> Client (Sync)

Size Description Type Notes
1 Player ID Byte -
2 Mana Int16 -
2 Max Mana Int16 -

Mana Effect [43]

Server <-> Client (Sync)

Size Description Type Notes
1 Player ID Byte -
2 Mana Amount Int16 -

Player Team [45]

Server <-> Client (Sync)

Size Description Type Notes
1 Player ID Byte -
1 Team Byte -

Request Sign [46]

Client -> Server

Size Description Type Notes
2 X Int16 -
2 Y Int16 -

Update Sign [47]

Updates sign if sent from client otherwise displays sign to client.

Size Description Type Notes
2 Sign ID Int16 -
2 X Int16 -
2 Y Int16 -
? Text String -
1 Player ID Byte -

Set Liquid [48]

Server <-> Client (Sync)

Size Description Type Notes
2 X Int16 -
2 Y Int16 -
1 Liquid Byte -
1 Liquid Type Byte -

Complete Connection and Spawn [49]

Server -> Client

Size Description Type Notes
- -

Update Player Buff [50]

Server <-> Client (Sync)

Size Description Type Notes
1 Player ID Byte -
1 * 22 BuffType Byte[22]

Special NPC Effect [51]

Server <-> Client (Sync)

Size Description Type Notes
1 Player ID Byte -
1 Type Byte Values: 1 = Spawn Skeletron, 2 = Cause sound at player, 3 = Start Sundialing (Only works if server is receiving), 4 = BigMimcSpawnSmoke

Unlock [52]

Server <-> Client (Sync)

Size Description Type Notes
1 Type Byte Values: 1 = Chest Unlock, 2 = Door Unlock
2 X Int16 -
2 Y Int16 -

Add NPC Buff [53]

Server <-> Client (Sync)

Size Description Type Notes
2 NPC ID Int16 -
1 Buff Byte -
2 Time Int16 -

Update NPC Buff [54]

Server -> Client

Size Description Type Notes
2 NPC ID Int16 -
1 Buff ID Byte -
2 Time Int16 -
1 Buff ID 2 Byte -
2 Time 2 Int16 -
1 Buff ID 3 Byte -
2 Time 3 Int16 -
1 Buff ID 4 Byte -
2 Time 4 Int16 -
1 Buff ID 5 Byte -
2 Time 5 Int16 -

Add Player Buff [55]

Server <-> Client (Sync)

Size Description Type Notes
1 Player ID Byte -
1 Buff Byte -
4 Time Int32 -

Update NPC Name [56]

Server <-> Client (Sync)

Size Description Type Notes
2 NPC ID Int16 -
? Name String Only if client is receiving packet

Update Good Evil [57]

Server -> Client

Size Description Type Notes
1 Good Byte -
1 Evil Byte -
1 Crimson Byte -

Play Music Item [58]

Server <-> Client (Sync)

Size Description Type Notes
1 Player ID Byte -
4 Note Single -

Hit Switch [59]

Server <-> Client (Sync)

Size Description Type Notes
2 X Int16 -
2 Y Int16 -

NPC Home Update [60]

Server <-> Client (Sync)

Size Description Type Notes
2 NPC ID Int16 -
2 HomeTileX Int16 -
2 HomeTileY Int16 -
1 Homeless Byte -

Spawn Boss Invasion [61]

Client -> Server

Size Description Type Notes
2 Player ID Int16 -
2 Type Int16 Negative Values: -1 = GoblinInvasion, -2 = FrostInvasion, -3 = PirateInvasion, -4 = PumpkinMoon, -5 = SnowMoon, -6 = Eclipse, -7 = Martian Moon Positive Values: Spawns any of these NPCs:4,13,50,126,125,134,127,128,131,129,130,222,245,266,370,75,398,439,493,507,422,517

Player Dodge [62]

Server <-> Client (Sync)

Size Description Type Notes
1 Player ID Byte -
1 Flag Byte 1 = Ninja Dodge 2 = Shadow Dodge

Paint Tile [63]

Server <-> Client (Sync)

Size Description Type Notes
2 X Int16 -
2 Y Int16 -
1 Color Byte -

Paint Wall [64]

Server <-> Client (Sync)

Size Description Type Notes
2 X Int16 -
2 Y Int16 -
1 Color Byte -

Player NPC Teleport [65]

Server <-> Client (Sync)

Size Description Type Notes
1 Flags Byte BitFlags: 0 = Player Teleport (Neither 1 or 2), 1 = NPC Teleport, 2 = Player Teleport to Other Player, 4 = Style += 1, 8 = Style += 2
2 Target ID Int16 -
4 X Single -
4 Y Single -

Heal Other Player [66]

Server <-> Client (Sync)

Size Description Type Notes
1 Player ID Byte -
2 Heal Amount Int16 -

Placeholder [67]

Does not exist in the official client. Exists solely for the purpose of being used by custom clients and servers.

Size Description Type Notes
- -

Client UUID [68]

Client -> Server

Size Description Type Notes
? UUID String

Get Chest Name [69]

Server <-> Client (Sync)

Size Description Type Notes
2 Chest ID Int16 -
2 Chest X Int16 -
2 Chest Y Int16 -
? Name String -

Catch NPC [70]

Client -> Server

Size Description Type Notes
2 NPC ID Int16 -
1 Who Byte -

Release NPC [71]

Client -> Server

Size Description Type Notes
4 X Int32 -
4 Y Int32 -
2 NPC Type Int16 -
1 Style Byte Sent to NPC AI[2]

Travelling Merchant Inventory [72]

Server -> Client

Size Description Type Notes
2*40 Items Int16[40] Each short related to an item type NetID.

Teleportation Potion [73]

Server <-> Client

Size Description Type Notes

Angler Quest [74]

Server -> Client

Size Description Type Notes
1 Quest Byte -
1 Completed Boolean -

Complete Angler Quest Today [75]

Client -> Server

Size Description Type Notes

Number Of Angler Quests Completed [76]

Client -> Server

Size Description Type Notes
1 Player ID Byte -
4 Angler Quests Completed Int32 -

Create Temporary Animation [77]

Server -> Client

Size Description Type Notes
2 AnimationType Int16 -
2 TileType UInt16 -
2 X Int16 -
2 Y Int16 -

Report Invasion Progress [78]

Server -> Client

Size Description Type Notes
4 Progress Int32 -
4 MaxProgress Int32 -
1 Icon SByte -
1 Wave SByte -

Place Object [79]

Server <-> Client

Size Description Type Notes
2 X Int16 -
2 Y Int16 -
2 Type Int16 -
2 Style Int16 -
1 Alternate Byte -
1 Random SByte -
1 Direction Boolean -

Sync Player Chest Index [80]

Server -> Client

Size Description Type Notes
1 Player Byte -
2 Chest Int16 -

Create Combat Text [81]

Server -> Client

Size Description Type Notes
4 X Single -
4 Y Single -
3 Color Color -
4 Heal Amount Int32 -

Load Net Module [82]

Client -> Server

Size Description Type Notes
2 Module ID Unsigned Short
?? Payload ??

Note: 82 is sent prior to chat packets in 1.3.5.x. Instructs the server to load a net module.

Set NPC Kill Count [83]

Server -> Client

Size Description Type Notes
2 NPC Type Int16 -
4 Kill Count Int32 -

Set Player Stealth [84]

Server <-> Client (Sync)

Size Description Type Notes
1 Player Byte -
4 Stealth Single -

Force Item Into Nearest Chest [85]

Client -> Server

Size Description Type Notes
1 Inventory Slot Byte -

Update Tile Entity [86]

Server -> Client

Size Description Type Notes
4 Key Int32 -
1 Remove? Boolean -
1 TileEntity Type Byte If Remove? == false
4 ID Int32 If Remove? == false
2 X Int16 If Remove? == false
2 Y Int16 If Remove? == false
2 NPC Int16 If Remove? == false && Type = 0
2 ItemType Int16 If Remove? == false
1 Prefix Byte If Remove? == false
2 Stack Int16 If Remove? == false

Place Tile Entity [87]

Client -> Server

Size Description Type Notes
2 X Int16 -
2 Y Int16 -
1 Type Byte 2 = Logic Sensor 1 = Item Frame 0 = Training Dummy

Tweak Item (FKA. Alter Item Drop) [88]

Server -> Client

Size Description Type Notes
2 Item Index Int16 -
1 Flags1 Byte BitFlags: 1 = Color, 2 = Damage, 4 = Knockback, 8 = UseAnimation, 16 = UseTime, 32 = Shoot, 64 = ShootSpeed, 128 = NextFlags
4 Packed Color Value UInt32 if Flags1.Color
2 Damage UInt16 if Flags1.Damage
4 Knockback Single if Flags1.Knockback
2 Use Animation UInt16 if Flags1.UseAnimation
2 Use Time UInt16 if Flags1.UseTime
2 Shoot Int16 if Flags1.Shoot
4 Shoot Speed Float if Flags1.ShootSpeed
1 Flags2 Byte if Flags1.NextFlags BitFlags: 1 = Width, 2 = Height, 4 = Scale, 8 = Ammo, 16 = UseAmmo, 32 = NotAmmo
2 Width Int16 if Flags2.Width
2 Height Int16 if Flags2.Height
4 Scale Float if Flags2.Scale
2 Ammo Int16 If Flags2.Ammo
2 UseAmmo Int16 If Flags2.UseAmmo
1 NotAmmo Bool If Flags2.NotAmmo

Place Item Frame [89]

Client -> Server

Size Description Type Notes
2 X Int16 -
2 Y Int16 -
2 Item Id Int16 -
1 Prefix Byte -
2 Stack Int16 -

Update Item Drop 2 [90]

Server <-> Client (Sync)

Size Description Type Notes
2 ItemID Int16 If below 400 and NetID 0 Then Set NullIf ItemID is 400 Then New Item
4 PositionX Single -
4 PositionY Single -
4 VelocityX Single -
4 VelocityY Single -
2 Stack Size Int16 -
1 Prefix Byte -
1 NoDelay Byte If 0 then ownIgnore = 0 and ownTime = 100
2 Item NetID Int16 -

Sync Emote Bubble [91]

Server -> Client

Size Description Type Notes
4 Emote ID Int32 -
1 Anchor Type Byte -
2 MetaData UInt16 Only if AnchorType != 255
1 Lifetime Byte Only if AnchorType != 255
1 Emote Byte Only if AnchorType != 255
2 EmoteMetaData Int16 Only sent if AnchorType != 255 and Emote < 0

Sync Extra Value [92]

Server <-> Client (Sync)

Size Description Type Notes
2 NPC Index Int16 -
4 ExtraValue Single -
4 X Single -
4 Y Single -

Social Handshake [93]

Not used

Size Description Type Notes

Deprecated [94]

Not used

Size Description Type Notes

Kill Portal [95]

Client -> Server

Size Description Type Notes
2 Projectile Index UInt16 -

Player Teleport Portal [96]

Server <-> Client

Size Description Type Notes
1 Player ID Byte -
2 Portal Color Index Int16 -
4 New Position X Single -
4 New Position Y Single -
4 Velocity X Single -
4 Velocity Y Single -

Notify Player NPC Killed [97]

Server -> Client

Size Description Type Notes
2 NPC ID Int16 -

Notify Player Of Event [98]

Server -> Client

Size Description Type Notes
2 Event ID Int16 -

Update Minion Target [99]

Server <-> Client (Sync)

Size Description Type Notes
1 Player ID Byte -
4 Target X Single -
4 Target Y Single -

NPC Teleport Portal [100]

Server <-> Client

Size Description Type Notes
2 NPC ID UInt16 -
2 Portal Color Index Int16 -
4 New Position X Single -
4 New Position Y Single -
4 Velocity X Single -
4 Velocity Y Single -

Update Shield Strengths [101]

Server -> Client

Size Description Type Notes
2 Solar Tower Shield UInt16 -
2 Vortex Tower Shield UInt16 -
2 Nebula Tower Shield UInt16 -
2 Stardust Tower Shield UInt16 -

Nebula Level Up [102]

Server <-> Client (Sync)

Size Description Type Notes
1 Player ID Byte -
1 Level Up Type Byte -
4 Origin X Single In world coordinate pixels.
4 Origin Y Single In world coordinate pixels.

Moon Lord Countdown [103]

Server -> Client

Size Description Type Notes
4 Moon Lord Countdown Int32 -

NPC Shop Item [104]

Server -> Client

Size Description Type Notes
1 Slot Byte -
2 Item Type Int16 -
2 Stack Int16 -
1 Prefix Byte -
4 Value Int32 -
1 Flags Byte BitFlags: 1 = BuyOnce

Gem Lock Toggle [105]

Client -> Server

Size Description Type Notes
2 X Int16 -
2 Y Int16 -
1 On Boolean -

Poof of Smoke [106]

Server -> Client

Size Description Type Notes
4 PackedVector Int32 Two Int16's packed into 4 bytes.

Smart Text Message (FKA. Chat Message v2) [107]

Server -> Client

Size Description Type Notes
3 Message Color Color Client cannot change colors
? Message NetworkText
2 Message Length Int16

Wired Cannon Shot [108]

Server -> Client

Size Description Type Notes
2 Damage Int16 -
4 Knockback Single -
2 X Int16 -
2 Y Int16 -
2 Angle Int16 -
2 Ammo Int16 -
1 Player ID Byte Shooter's Player ID

Mass Wire Operation [109]

Client -> Server

Size Description Type Notes
2 Start X Int16 -
2 Start Y Int16 -
2 End X Int16 -
2 End Y Int16 -
1 ToolMode Byte BitFlags: 1 = Red, 2 = Green, 4 = Blue, 8 = Yellow, 16 = Actuator, 32 = Cutter

Mass Wire Operation Consume [110]

Server -> Client

Size Description Type Notes
2 Item Type Int16 -
2 Quantity Int16 -
1 Player ID Byte -

Toggle Birthday Party [111]

Client -> Server

Size Description Type Notes

GrowFX [112]

Server <-> Client (Sync)

Size Description Type Notes
1 GrowEffect Boolean -
2 X Int16 -
2 Y Int16 -
1 Height Byte -
2 Tree Gore Int16 -

CrystalInvasionStart [113]

Client -> Server

Size Description Type Notes
2 X Int16 -
2 Y Int16 -

CrystalInvasionWipeAll [114]

Server -> Client

Size Description Type Notes

MinionAttackTargetUpdate [115]

Client -> Server

Size Description Type Notes
1 Player ID Byte -
2 Minion Attack Target Int16 -

CrystalInvasionSendWaitTime [116]

Server -> Client

Size Description Type Notes
4 Time Until Next Wave Int32 1800 (30s) between waves, 30 (5s) when starting

PlayerHurtV2 [117]

Client -> Server

Size Description Type Notes
1 Player ID Byte -
? Player Death Reason PlayerDeathReason -
2 Damage Int16 -
1 Hit Direction Byte -
1 Flags Byte BitFlags: 1 = Crit, 2 = PvP
1 Cooldown Counter SByte -

PlayerDeathV2 [118]

Client -> Server

Size Description Type Notes
1 Player ID Byte -
? Player Death Reason PlayerDeathReason -
2 Damage Int16 -
1 Hit Direction Byte -
1 Flags Byte BitFlags: 1 = PvP

CombatTextString [119]

Client <-> Server

Size Description Type Notes
4 X Single -
4 Y Single -
3 Color Color -
? Combat Text NetworkText -
Raw
combined.md

Connect Request [1]

Client -> Server

Size Description Type Notes
? Version String "Terraria" + Main.curRelease

Disconnect [2]

Server -> Client

Size Description Type Notes
? Reason NetworkText -

Set User Slot [3]

Server -> Client

Size Description Type Notes
1 Player ID Byte -

Player Info [4]

Server <-> Client (Sync)

Size Description Type Notes
1 Player ID Byte -
1 Skin Varient Byte -
1 Hair Byte If >162 then Set To 0
? Name String -
1 Hair Dye Byte -
1 Hide Visuals Byte -
1 Hide Visuals 2 Byte -
1 Hide Misc Byte -
3 Hair Color Color -
3 Skin Color Color -
3 Eye Color Color -
3 Shirt Color Color -
3 Under Shirt Color Color -
3 Pants Color Color -
3 Shoe Color Color -
1 Difficulty Byte -

Player Inventory Slot [5]

Server <-> Client (Sync)

Size Description Type Notes
1 Player ID Byte -
1 Slot ID Int16 0 - 58 = Inventory, 59 - 78 = Armor, 79 - 88 = Dye, 89 - 93 MiscEquips, 94 - 98 = MiscDyes, 99 - 138 = Piggy bank, 139-178 = Safe, 179 = Trash
2 Stack Int16 -
1 Prefix Byte -
2 Item NetID Int16 -

Request World Data [6]

Client -> Server

Size Description Type Notes

World Info [7]

Server -> Client

Size Description Type Notes
4 Time Int32 -
1 Day and Moon Info Byte BitFlags: 1 = Day Time, 2 = Blood Moon, 4 = Eclipse
1 Moon Phase Byte -
2 Max Tiles X Int16 -
2 Max Tiles Y Int16 -
2 Spawn X Int16 -
2 Spawn Y Int16 -
2 WorldSurface Int16 -
2 RockLayer Int16 -
4 World ID Int32 -
? World Name String -
1 Game Mode Byte -
16 World Unique ID Byte[] -
8 World Generator Version UInt64 -
1 Moon Type Byte -
1 Tree Background Byte -
1 Corruption Background Byte -
1 Jungle Background Byte -
1 Snow Background Byte -
1 Hallow Background Byte -
1 Crimson Background Byte -
1 Desert Background Byte -
1 Ocean Background Byte -
1 ?? Background Byte -
1 ?? Background Byte -
1 ?? Background Byte -
1 ?? Background Byte -
1 ?? Background Byte -
1 Ice Back Style Byte -
1 Jungle Back Style Byte -
1 Hell Back Style Byte -
4 Wind Speed Set Single -
1 Cloud Number Byte -
4 Tree 1 Int32 -
4 Tree 2 Int32 -
4 Tree 3 Int32 -
1 Tree Style 1 Byte -
1 Tree Style 2 Byte -
1 Tree Style 3 Byte -
1 Tree Style 4 Byte -
4 Cave Back 1 Int32 -
4 Cave Back 2 Int32 -
4 Cave Back 3 Int32 -
1 Cave Back Style 1 Byte -
1 Cave Back Style 2 Byte -
1 Cave Back Style 3 Byte -
1 Cave Back Style 4 Byte -
4 Forest 1 Tree Top Style Int32 -
4 Forest 2 Tree Top Style Int32 -
4 Forest 3 Tree Top Style Int32 -
4 Forest 4 Tree Top Style Int32 -
4 Corruption Tree Top Style Int32 -
4 Jungle Tree Top Style Int32 -
4 Snow Tree Top Style Int32 -
4 Hallow Tree Top Style Int32 -
4 Crimson Tree Top Style Int32 -
4 Desert Tree Top Style Int32 -
4 Ocean Tree Top Style Int32 -
4 Glowing Mushroom Tree Top Style Int32 -
4 Underworld Tree Top Style Int32 -
4 Rain Single -
1 Event Info Byte BitFlags: 1 = Shadow Orb Smashed, 2 = Downed Boss 1, 4 = Downed Boss 2, 8 = Downed Boss 3, 16 = Hard Mode, 32 = Downed Clown, 64 = Server Side Character, 128 = Downed Plant Boss
1 Event Info 2 Byte BitFlags: 1 = Mech Boss Downed, 2 = Mech Boss Downed 2, 4 = Mech Boss Downed 3, 8 = Mech Boss Any Downed, 16 = Cloud BG, 32 = Crimson, 64 = Pumpkin Moon, 128 = Snow Moon
1 Event Info 3 Byte BitFlags: 1 = Expert Mode, 2 = FastForwardTime, 4 = Slime Rain, 8 = Downed Slime King, 16 = Downed Queen Bee, 32 = Downed Fishron, 64 = Downed Martians, 128 = Downed Ancient Cultist
1 Event Info 4 Byte BitFlags: 1 = Downed Moon Lord, 2 = Downed Pumking, 4 = Downed Mourning Wood, 8 = Downed Ice Queen, 16 = Downed Santank, 32 = Downed Everscream, 64 = Downed Golem, 128 = Birthday Party
1 Event Info 5 Byte BitFlags: 1 = Downed Pirates, 2 = Downed Frost Legion, 4 = Downed Goblins, 8 = Sandstorm, 16 = DD2 Event, 32 = Downed DD2 Tier 1, 64 = Downed DD2 Tier 2, 128 = Downed DD2 Tier 3
1 Event Info 6 Byte BitFlags: 1 = Combat Book Used, 2 = Manual Lanterns, 4 = Downed Solar Tower, 8 = Downed Vortex Tower, 16 = Downed Tower Nebula, 32 = Downed Stardust Tower, 64 = Force Halloween (day), 128 = Force XMas (day)
1 Event Info 7 Byte BitFlags: 1 = Bought Cat, 2 = Bought Dog, 4 = Bought Bunny, 8 = Free Cake, 16 = Drunk World, 32 = Downed Empress of Light, 64 = Downed Queen Slime
2 Copper Ore Tier Int16 Tile ID 7 or 166
2 Iron Ore Tier Int16 Tile ID 6 or 167
2 Silver Ore Tier Int16 Tile ID 9 or 168
2 Gold Ore Tier Int16 Tile ID 8 or 169
2 Cobalt Ore Tier Int16 Tile ID 107 or 221
2 Mythril Ore Tier Int16 Tile ID 108 or 222
2 Adamantite Ore Tier Int16 Tile ID 111 or 223
1 Invasion Type SByte -
8 Lobby ID UInt64 -
4 Sandstorm Severity Single -

Request Essential Tiles [8]

This packet is used once in the connecting phase and does the following:

  1. Sends you the spawn sections
  2. Optionally, if spawn coords aren't -1 - sends you the sections of the selected position (which is the player's spawnpoint)
  3. Synchronises all portals and sections around them

Client -> Server

Size Description Type Notes
4 X Int32 Player Spawn X
4 Y Int32 Player Spawn Y

Status [9]

Server -> Client

Size Description Type Notes
4 StatusMax Int32 Status only increases
? Status Text NetworkText -
1 Status Text Flags Byte -

Send Section [10]

Server -> Client

Size Description Type Notes
1 Compressed Boolean -
4 X Start Int32 -
4 Y Start Int32 -
2 Width Int16 -
2 Height Int16 -
? Tiles -
2 Chest Count Int16 -
? Chests -
2 Sign Count Int16 -
? Signs -
2 TileEntity Count Int16 -
? TileEntities - -

Section Tile Frame [11]

Server -> Client

Size Description Type Notes
2 Start X Int16 -
2 Start Y Int16 -
2 End X Int16 -
2 End Y Int16 -

Spawn Player [12]

Client -> Server

Size Description Type Notes
1 Player ID Byte -
2 Spawn X Int16 -
2 Spawn Y Int16 -
4 Respawn Time Remaining Int32 If > 0, then player is still dead
1 Player Spawn Context Byte Enum: 0 = ReviveFromDeath, 1 = SpawningIntoWorld, 2 = RecallFromItem

Update Player [13]

Server <-> Client (Sync)

Size Description Type Notes
1 Player ID Byte -
1 Control Byte BitFlags: 1 = ControlUp, 2 = ControlDown, 4 = ControlLeft, 8 = ControlRight, 16 = ControlJump, 32 = ControlUseItem, 64 = Direction
1 Pulley Byte BitFlags: 1 = Pulley Enabled, 2 = Direction, 4 = UpdateVelocity, 8 = VortexStealthActive, 16 = GravityDirection, 32 = ShieldRaised
1 Misc Byte BitFlags: 1 = HoveringUp, 2 = VoidVaultEnabled, 4 = Sitting, 8 = DownedDD2Event, 16 = IsPettingAnimal, 32 = IsPettingSmallAnimal, 64 = UsedPotionofReturn, 128 = HoveringDown
1 SleepingInfo Byte BitFlags: 1 = IsSleeping
4 Original Position X Single Original Poisition for Potion of Return, only sent if UsedPotionofReturn flag is true
4 Original Position Y Single Original Poisition for Potion of Return, only sent if UsedPotionofReturn flag is true
4 Home Position X Single Home Position for Potion of Return, only sent if UsedPotionofReturn flag is true
4 Home Position Y Single Home Position for Potion of Return, only sent if UsedPotionofReturn flag is true
1 Selected Item Byte -
4 Position X Single -
4 Position Y Single -
4 Velocity X Single Not sent if UpdateVelocity is not set
4 Velocity Y Single Not sent if UpdateVelocity is not set

Player Active [14]

Server -> Client

Size Description Type Notes
1 Player ID Byte -
1 Active Boolean -

Null [15]

Never sent

Size Description Type Notes

Player HP [16]

Server <-> Client (Sync)

Size Description Type Notes
1 Player ID Byte -
2 HP Int16 -
2 Max HP Int16 -

Modify Tile [17]

Server <-> Client (Sync)

Size Description Type Notes
1 Action Byte Values: 0 = KillTile, 1 = PlaceTile, 2 = KillWall, 3 = PlaceWall, 4 = KillTileNoItem, 5 = PlaceWire, 6 = KillWire, 7 = PoundTile, 8 = PlaceActuator, 9 = KillActuator, 10 = PlaceWire2, 11 = KillWire2, 12 = PlaceWire3, 13 = KillWire3, 14 = SlopeTile, 15 = FrameTrack, 16 = PlaceWire4, 17 = KillWire4, 18 = PokeLogicGate, 19 = Actuate, 20 = KillTile, 21 = ReplaceTile, 22 = ReplaceWall, 23 = SlopePoundTile
2 Tile X Int16 -
2 Tile Y Int16 -
2 Flags1 Int16 KillTile (Fail: Bool), PlaceTile (Type: Byte), KillWall (Fail: Bool), PlaceWall (Type: Byte), KillTileNoItem (Fail: Bool), SlopeTile (Slope: Byte), ReplaceTile (Type: Int16), ReplaceWall (Type: Int16)
1 Flags2 Byte PlaceTile (Style: Byte), ReplaceTile (Style: Byte)

Time [18]

Server -> Client

Size Description Type Notes
1 DayTime Boolean -
4 TimeValue Int32 -
2 SunModY Int16 -
2 MoonModY Int16 -

Door Toggle [19]

Server <-> Client (Sync)

Size Description Type Notes
1 Action Byte 0 = Open Door, 1 = Close Door, 2 = Open Trapdoor, 3 = Close Trapdoor, 4 = Open Tall Gate, 5 = Close Tall Gate
2 Tile X Int16 -
2 Tile Y Int16 -
1 Direction Byte If (Action == 0) then (if (Direction == -1) then OpenToLeft else OpenToRight) if (Action == 2) then (if (Direction == 1) then PlayerIsAboveTrapdoor) if (Action == 3) then (if (Direction == 1) then PlayerIsAboveTrapdoor)

Send Tile Square [20]

Server <-> Client (Sync)

Size Description Type Notes
2 Player ID UInt16 -
1 TileChangeType Byte Only if != 0
2 Size Int16 -
2 Tile X Int16 -
2 Tile Y Int16 -
? Tiles -

Update Item Drop [21]

See Update Item Drop 2 [90]

Update Item Owner [22]

Server <-> Client (Sync)

Size Description Type Notes
2 Item ID Int16 -
1 Player ID Byte -

NPC Update [23]

Server -> Client

Size Description Type Notes
2 NPC ID Int16 -
4 Position X Single -
4 Position Y Single -
4 Velocity X Single -
4 Velocity Y Single -
2 Target UInt16 Player ID
1 Flags Byte BitFlags: 1 = Direction, 2 = DirectionY, 4 = AI[0], 8 = AI[1], 16 = AI[2], 32 = AI[3], 64 = SpriteDirection, 128 = LifeMax
? AI[?] Single[] Requires the AI flag to be set in order to be sent down the wire
2 NPC NetID Int16 -
1 LifeBytes Byte The size in bytes of Life, only present if !Flags[7] (LifeMax)
? Life Byte or Int16 or Int32 Only present if !Flags[7] (LifeMax)
1 ReleaseOwner Byte Only present if NPC is catchable

Strike NPCwith Held Item [24]

Server <-> Client (Sync)

Size Description Type Notes
2 NPC ID Int16 -
1 Player ID Byte -

Null [25]

Never sent

Size Description Type Notes

Null [26]

Never sent

Size Description Type Notes

Projectile Update [27]

Server <-> Client (Sync)

Size Description Type Notes
2 Projectile ID Int16 -
4 Position X Single -
4 Position Y Single -
4 Velocity X Single -
4 Velocity Y Single -
1 Owner Byte Player ID
2 Type Int16 -
1 ProjFlags Byte BitFlags: 1 = AI[0], 2 = AI[1], 16 = Damage, 32 = Knockback, 64 = OriginalDamage, 128 = ProjUUID
4 AI0 Single Only sent if AI[0] flag is true
4 AI1 Single Only sent if AI[1] flag is true
2 Damage Int16 Only sent if Damage flag is true
4 Knockback Single Only sent if Knockback flag is true
2 Original Damage Int16 Only sent if OriginalDamage flag is true
2 Proj UUID Int16 Only sent if ProjUUID flag is true

NPC Strike [28]

Server <-> Client (Sync)

Size Description Type Notes
2 NPC ID Int16 -
2 Damage Int16 -1 = Kill
4 Knockback Single -
1 Hit Direction Byte -
1 Crit Boolean -

Destroy Projectile [29]

Server <-> Client (Sync)

Size Description Type Notes
2 Projectile ID Int16 -
1 Owner Byte Player ID

Toggle P V P [30]

Server <-> Client (Sync)

Size Description Type Notes
1 Player ID Byte -
1 PVP Enabled Boolean -

Open Chest [31]

Client -> Server

Size Description Type Notes
2 Tile X Int16 -
2 Tile Y Int16 -

Packet [31] is always used to "open" a world chest (that is, an item container placed in the world). When this packet is received the server will send the chest's contents, and sync the active chest ID to the player using packet [33].

Update Chest Item [32]

Server <-> Client (Sync)

Size Description Type Notes
2 Chest ID Int16 -
1 Item Slot Byte -
2 Stack Int16 -
1 Prefix Byte -
2 Item Net ID Int16 -

Sync Active Chest [33]

Server <-> Client (Sync)

Size Description Type Notes
2 Chest ID Int16 -
2 Chest X Int16 -
2 Chest Y Int16 -
1 Name Length Byte -
? Chest Name String Only if length > 0 && <= 20

This packet is used to tell the server that you've exited the chest view (sending ID -1), that you're looking at your piggy bank (sending ID -2), that you're looking at your safe (sending ID -3) and that you're looking at your defender's forge (sending ID -4). Those are sent at every chest interaction. Packet [33]'s main function is to synchronize the sending client's active chest to the server, and its side function is to rename the chest. It should be noted that this packet is not sent when you open a regular chest. The server knows which chest you opened when you send [31], so the [33] is only sent upon exit to unblock the chest (as opposed to both open & exit for banks like piggy, safe & defender forge)

PlaceChest [34]

Server <-> Client

Size Description Type Notes
1 Chest ID Byte BitFlags:0 = Place Chest, 1 = Kill Chest, 2 = Place Dresser, 3 = Kill Dresser. 4 = Place Containers2, 5 = Kill Containers2
2 Tile X Int16 -
2 Tile Y Int16 -
2 Style Int16 FrameX(Chest type)
2 Chest ID to destroy Int16 ID if client is receiving packet, else 0

Heal Effect [35]

Server <-> Client (Sync)

Size Description Type Notes
1 Player ID Byte -
2 Heal Amount Int16 -

Player Zone [36]

Server <-> Client (Sync)

Size Description Type Notes
1 Player ID Byte -
1 ZoneFlags1 Byte 1 = Dungeon, 2 = Corruption, 4 =Holy, 8 = Meteor, 16 = Jungle, 32 = Snow, 64 = Crimson, 128 = Water Candle
1 ZoneFlags2 Byte 1 = Peace Candle, 2 = Solar Tower, 4 = Vortex Tower, 8 = Nebula Tower, 16 = Stardust Tower, 32 = Desert, 64 = Glowshroom, 128 = Underground Desert
1 ZoneFlags3 Byte 1 = Overworld, 2 = Dirt Layer, 4 = Rock Layer, 8 = Underworld, 16 = Beach, 32 = Rain, 64 = Sandstorm
1 ZoneFlags4 Byte 1 = Old One's Army, 2 = Granite, 4 = Marble, 8 = Hive, 16 = Gem Cave, 32 = Lihzhard Temple, 64 = Graveyard

Request Password [37]

Server -> Client

Size Description Type Notes

Send Password [38]

Client -> Server

Size Description Type Notes
? Password String -

Remove Item Owner [39]

Server -> Client

Size Description Type Notes
2 Item Index Int16 -

Set Active NPC [40]

Server <-> Client (Sync)

Size Description Type Notes
1 Player ID Byte -
2 NPC Talk Target Int16 -

Player Item Animation [41]

Server <-> Client (Sync)

Size Description Type Notes
1 Player ID Byte -
4 Item Rotation Single -
2 Item Animation Int16 -

Player Mana [42]

Server <-> Client (Sync)

Size Description Type Notes
1 Player ID Byte -
2 Mana Int16 -
2 Max Mana Int16 -

Mana Effect [43]

Server <-> Client (Sync)

Size Description Type Notes
1 Player ID Byte -
2 Mana Amount Int16 -

Null [44]

Never sent

Size Description Type Notes

Player Team [45]

Server <-> Client (Sync)

Size Description Type Notes
1 Player ID Byte -
1 Team Byte -

Request Sign [46]

Client -> Server

Size Description Type Notes
2 X Int16 -
2 Y Int16 -

Update Sign [47]

Updates sign if sent from client otherwise displays sign to client.

Size Description Type Notes
2 Sign ID Int16 -
2 X Int16 -
2 Y Int16 -
? Text String -
1 Player ID Byte -
1 SignFlags Byte BitFlags: 1 = TBD

Set Liquid [48]

Server <-> Client (Sync)

Size Description Type Notes
2 X Int16 -
2 Y Int16 -
1 Liquid Byte -
1 Liquid Type Byte -

Complete Connection and Spawn [49]

Server -> Client

Size Description Type Notes
- - - -

Update Player Buff [50]

Server <-> Client (Sync)

Size Description Type Notes
1 Player ID Byte -
2 * 22 BuffType UInt16[22] -

Special NPC Effect [51]

Server <-> Client (Sync)

Size Description Type Notes
1 Player ID Byte -
1 Type Byte Values: 1 = Spawn Skeletron, 2 = Cause sound at player, 3 = Start Sundialing (Only works if server is receiving), 4 = BigMimcSpawnSmoke

Unlock [52]

Server <-> Client (Sync)

Size Description Type Notes
1 Type Byte Values: 1 = Chest Unlock, 2 = Door Unlock
2 X Int16 -
2 Y Int16 -

Add NPC Buff [53]

Server <-> Client (Sync)

Size Description Type Notes
2 NPC ID Int16 -
2 Buff UInt16 -
2 Time Int16 -

Update NPC Buff [54]

Server -> Client

Size Description Type Notes
2 NPC ID Int16 -
2 Buff ID 1 UInt16 -
2 Time 1 Int16 -
2 Buff ID 2 UInt16 -
2 Time 2 Int16 -
2 Buff ID 3 UInt16 -
2 Time 3 Int16 -
2 Buff ID 4 UInt16 -
2 Time 4 Int16 -
2 Buff ID 5 UInt16 -
2 Time 5 Int16 -

Add Player Buff [55]

Server <-> Client (Sync)

Size Description Type Notes
1 Player ID Byte -
2 Buff UInt16 -
4 Time Int32 -

Update NPC Name [56]

Server <-> Client (Sync)

Size Description Type Notes
2 NPC ID Int16 -
? Name String Only if client is receiving packet
4 TownNpcVariationIndex Int32 Only if client is receiving packet

Update Good Evil [57]

Server -> Client

Size Description Type Notes
1 Good Byte -
1 Evil Byte -
1 Crimson Byte -

Play Music Item [58]

Server <-> Client (Sync)

Size Description Type Notes
1 Player ID Byte -
4 Note Single -

Hit Switch [59]

Server <-> Client (Sync)

Size Description Type Notes
2 X Int16 -
2 Y Int16 -

NPC Home Update [60]

Server <-> Client (Sync)

Size Description Type Notes
2 NPC ID Int16 -
2 Home Tile X Int16 -
2 Home Tile Y Int16 -
1 Homeless Byte -

Spawn Boss Invasion [61]

Client -> Server

Size Description Type Notes
2 Player ID Int16 -
2 Type Int16 Negative Values: -1 = GoblinInvasion, -2 = FrostInvasion, -3 = PirateInvasion, -4 = PumpkinMoon, -5 = SnowMoon, -6 = Eclipse, -7 = Martian Moon, -8 = Impending Doom, -10 = Blood Moon, -11 = Combat Book Used, -12 = Bought Cat, -13 = Bought Dog, -14 = Bought Bunny, Positive Values: Spawns any of these NPCs: 4, 13, 50, 126, 125, 134, 127, 128, 131, 129, 130, 222, 245, 266, 370, 657

Player Dodge [62]

Server <-> Client (Sync)

Size Description Type Notes
1 Player ID Byte -
1 Flag Byte 1 = Ninja Dodge 2 = Shadow Dodge

Paint Tile [63]

Server <-> Client (Sync)

Size Description Type Notes
2 X Int16 -
2 Y Int16 -
1 Color Byte -

Paint Wall [64]

Server <-> Client (Sync)

Size Description Type Notes
2 X Int16 -
2 Y Int16 -
1 Color Byte -

Player NPC Teleport [65]

Server <-> Client (Sync)

Size Description Type Notes
1 Flags Byte BitFlags: 0 = Player Teleport (Neither 1 or 2), 1 = NPC Teleport, 2 = Player Teleport to Other Player, 4 = GetPositionFromTarget, 8 = HasExtraInfo
2 Target ID Int16 -
4 X Single -
4 Y Single -
1 Style Byte -
4 ExtraInfo Int32 Only sent if HasExtraInfo flag is true

Heal Other Player [66]

Server <-> Client (Sync)

Size Description Type Notes
1 Player ID Byte -
2 Heal Amount Int16 -

Placeholder [67]

Does not exist in the official client. Exists solely for the purpose of being used by custom clients and servers.

Size Description Type Notes
- -

Client UUID [68]

Client -> Server

Size Description Type Notes
? UUID String

Get Chest Name [69]

Server <-> Client (Sync)

Size Description Type Notes
2 Chest ID Int16 -
2 Chest X Int16 -
2 Chest Y Int16 -
? Name String -

Catch NPC [70]

Client -> Server

Size Description Type Notes
2 NPC ID Int16 -
1 Player ID Byte -

Release NPC [71]

Client -> Server

Size Description Type Notes
4 X Int32 -
4 Y Int32 -
2 NPC Type Int16 -
1 Style Byte Sent to NPC AI[2]

Travelling Merchant Inventory [72]

Server -> Client

Size Description Type Notes
2*40 Items Int16[40] Each short related to an item type NetID.

Teleportation Potion [73]

Server <-> Client

Size Description Type Notes
1 Type Byte 0 = Teleportation Potion, 1 = Magic Conch, 2 = Demon Conch

Angler Quest [74]

Server -> Client

Size Description Type Notes
1 Quest Byte -
1 Completed Boolean -

Complete Angler Quest Today [75]

Client -> Server

Size Description Type Notes

Number Of Angler Quests Completed [76]

Client -> Server

Size Description Type Notes
1 Player ID Byte -
4 Angler Quests Completed Int32 -
4 Golfer Score Int32 -

Create Temporary Animation [77]

Server -> Client

Size Description Type Notes
2 Animation Type Int16 -
2 Tile Type UInt16 -
2 X Int16 -
2 Y Int16 -

Report Invasion Progress [78]

Server -> Client

Size Description Type Notes
4 Progress Int32 -
4 Max Progress Int32 -
1 Icon SByte -
1 Wave SByte -

Place Object [79]

Server <-> Client

Size Description Type Notes
2 X Int16 -
2 Y Int16 -
2 Type Int16 -
2 Style Int16 -
1 Alternate Byte -
1 Random SByte -
1 Direction Boolean -

Sync Player Chest Index [80]

Server -> Client

Size Description Type Notes
1 Player Byte -
2 Chest Int16 -

Create Combat Text [81]

Server -> Client

Size Description Type Notes
4 X Single -
4 Y Single -
3 Color Color -
4 Heal Amount Int32 -

Load Net Module [82]

Client -> Server

Size Description Type Notes
2 Module ID Unsigned Short
?? Payload ??

Note: 82 is sent prior to chat packets in 1.3.5.x. Instructs the server to load a net module.

Set NPC Kill Count [83]

Server -> Client

Size Description Type Notes
2 NPC Type Int16 -
4 Kill Count Int32 -

Set Player Stealth [84]

Server <-> Client (Sync)

Size Description Type Notes
1 Player Byte -
4 Stealth Single -

Force Item Into Nearest Chest [85]

Client -> Server

Size Description Type Notes
1 Inventory Slot Byte -

Update Tile Entity [86]

Server -> Client

Size Description Type Notes
4 TileEntityId Int32 -
1 UpdateTileFlag Boolean If UpdateTileFlag is false, TileEntity is removed
1 TileEntity Type Byte Only sent if UpdateTileFlag is false
2 X Int16 Only sent if UpdateTileFlag is false
2 Y Int16 Only sent if UpdateTileFlag is false

Place Tile Entity [87]

Client -> Server

Size Description Type Notes
2 X Int16 -
2 Y Int16 -
1 TileEntityType Byte 2 = Logic Sensor 1 = Item Frame 0 = Training Dummy

Tweak Item (FKA. Alter Item Drop) [88]

Server -> Client

Size Description Type Notes
2 Item Index Int16 -
1 Flags1 Byte BitFlags: 1 = Color, 2 = Damage, 4 = Knockback, 8 = UseAnimation, 16 = UseTime, 32 = Shoot, 64 = ShootSpeed, 128 = NextFlags
4 Packed Color Value UInt32 if Flags1.Color
2 Damage UInt16 if Flags1.Damage
4 Knockback Single if Flags1.Knockback
2 Use Animation UInt16 if Flags1.UseAnimation
2 Use Time UInt16 if Flags1.UseTime
2 Shoot Int16 if Flags1.Shoot
4 ShootSpeed Float if Flags1.ShootSpeed
1 Flags2 Byte if Flags1.NextFlags, BitFlags: 1 = Width, 2 = Height, 4 = Scale, 8 = Ammo, 16 = UseAmmo, 32 = NotAmmo
2 Width Int16 if Flags2.Width
2 Height Int16 if Flags2.Height
4 Scale Float if Flags2.Scale
2 Ammo Int16 If Flags2.Ammo
2 UseAmmo Int16 If Flags2.UseAmmo
1 NotAmmo Bool If Flags2.NotAmmo

Place Item Frame [89]

Client -> Server

Size Description Type Notes
2 X Int16 -
2 Y Int16 -
2 ItemId Int16 -
1 Prefix Byte -
2 Stack Int16 -

Update Item Drop 2 [90]

Server <-> Client (Sync)

Size Description Type Notes
2 Item ID Int16 If below 400 and NetID 0 Then Set NullIf ItemID is 400 Then New Item
4 Position X Single -
4 Position Y Single -
4 Velocity X Single -
4 Velocity Y Single -
2 Stack Size Int16 -
1 Prefix Byte -
1 NoDelay Byte If 0 then ownIgnore = 0 and ownTime = 100
2 Item Net ID Int16 -

Sync Emote Bubble [91]

Server -> Client

Size Description Type Notes
4 Emote ID Int32 -
1 Anchor Type Byte -
2 Player ID UInt16 Only sent if AnchorType != 255
2 Emote LifeTime UInt16 Only sent if AnchorType != 255
1 Emote Byte Only sent if AnchorType != 255
2 Emote MetaData Int16 Only sent if AnchorType != 255 and Emote < 0

Sync Extra Value [92]

Server <-> Client (Sync)

Size Description Type Notes
2 NPC Index Int16 -
4 Extra Value Int32 -
4 X Single -
4 Y Single -

Social Handshake [93]

Not used

Size Description Type Notes

Deprecated [94]

Not used

Size Description Type Notes

Kill Portal [95]

Client -> Server

Size Description Type Notes
2 Projectile Owner UInt16 -
1 Projectile AI Byte -

Player Teleport Portal [96]

Server <-> Client

Size Description Type Notes
1 Player ID Byte -
2 Portal Color Index Int16 -
4 New Position X Single -
4 New Position Y Single -
4 Velocity X Single -
4 Velocity Y Single -

Notify Player NPC Killed [97]

Server -> Client

Size Description Type Notes
2 NPC ID Int16 -

Notify Player Of Event [98]

Server -> Client

Size Description Type Notes
2 Event ID Int16 -

Update Minion Target [99]

Server <-> Client (Sync)

Size Description Type Notes
1 Player ID Byte -
4 Target X Single -
4 Target Y Single -

NPC Teleport Portal [100]

Server <-> Client

Size Description Type Notes
2 NPC ID UInt16 -
2 Portal Color Index Int16 -
4 New Position X Single -
4 New Position Y Single -
4 Velocity X Single -
4 Velocity Y Single -

Update Shield Strengths [101]

Server -> Client

Size Description Type Notes
2 Solar Tower Shield Strength UInt16 -
2 Vortex Tower Shield Strength UInt16 -
2 Nebula Tower Shield Strength UInt16 -
2 Stardust Tower Shield Strength UInt16 -

Nebula Level Up [102]

Server <-> Client (Sync)

Size Description Type Notes
1 Player ID Byte -
2 Level Up Type UInt16 -
4 Origin X Single In world coordinate pixels.
4 Origin Y Single In world coordinate pixels.

Moon Lord Countdown [103]

Server -> Client

Size Description Type Notes
4 Moon Lord Countdown Int32 -

NPC Shop Item [104]

Server -> Client

Size Description Type Notes
1 Slot Byte -
2 Item Type Int16 -
2 Stack Int16 -
1 Prefix Byte -
4 Value Int32 -
1 Flags Byte BitFlags: 1 = BuyOnce

Gem Lock Toggle [105]

Client -> Server

Size Description Type Notes
2 X Int16 -
2 Y Int16 -
1 On Boolean -

Poof of Smoke [106]

Server -> Client

Size Description Type Notes
4 PackedVector UInt32 Two Int16's packed into 4 bytes.

Smart Text Message (FKA. Chat Message v2) [107]

Server -> Client

Size Description Type Notes
3 Message Color Color Client cannot change colors
? Message NetworkText
2 Message Length Int16

Wired Cannon Shot [108]

Server -> Client

Size Description Type Notes
2 Damage Int16 -
4 Knockback Single -
2 X Int16 -
2 Y Int16 -
2 Angle Int16 -
2 Ammo Int16 -
1 Player ID Byte Shooter's Player ID

Mass Wire Operation [109]

Client -> Server

Size Description Type Notes
2 Start X Int16 -
2 Start Y Int16 -
2 End X Int16 -
2 End Y Int16 -
1 ToolMode Byte BitFlags: 1 = Red, 2 = Green, 4 = Blue, 8 = Yellow, 16 = Actuator, 32 = Cutter

Mass Wire Operation Consume [110]

Server -> Client

Size Description Type Notes
2 Item Type Int16 -
2 Quantity Int16 -
1 Player ID Byte -

Toggle Birthday Party [111]

Client -> Server

Size Description Type Notes

GrowFX [112]

Server <-> Client (Sync)

Size Description Type Notes
1 EffectFlags Byte 1 = Tree Growth Effects, 2 = Fairy Effects
4 X Int32 -
4 Y Int32 -
1 Height Byte -
2 Tree Gore Int16 -

CrystalInvasionStart [113]

Client -> Server

Size Description Type Notes
2 X Int16 -
2 Y Int16 -

CrystalInvasionWipeAll [114]

Server -> Client

Size Description Type Notes

MinionAttackTargetUpdate [115]

Client -> Server

Size Description Type Notes
1 Player ID Byte -
2 Minion Attack Target Int16 -

CrystalInvasionSendWaitTime [116]

Server -> Client

Size Description Type Notes
4 Time Until Next Wave Int32 1800 (30s) between waves, 30 (5s) when starting

PlayerHurtV2 [117]

Client -> Server

Size Description Type Notes
1 Player ID Byte -
? Player Death Reason PlayerDeathReason -
2 Damage Int16 -
1 Hit Direction Byte -
1 Flags Byte BitFlags: 1 = Crit, 2 = PvP
1 Cooldown Counter SByte -

PlayerDeathV2 [118]

Client -> Server

Size Description Type Notes
1 Player ID Byte -
? Player Death Reason PlayerDeathReason -
2 Damage Int16 -
1 Hit Direction Byte -
1 Flags Byte BitFlags: 1 = PvP

CombatTextString [119]

Client <-> Server

Size Description Type Notes
4 X Single -
4 Y Single -
3 Color Color -
? Combat Text NetworkText -

Emoji [120]

Client <-> Server

Size Description Type Notes
1 Player ID Byte -
1 Emoticon Byte -

TEDisplayDollItemSync [121]

Client <-> Server

Size Description Type Notes
1 Player ID Byte -
4 TileEntity ID Int32 -
1 Item Index Byte -
2 Item ID UInt16 -
2 Stack UInt16 -
1 Prefix Byte -

RequestTileEntityInteraction [122]

Client <-> Server

Size Description Type Notes
4 TileEntityID Int32 -
1 Player ID Byte -

WeaponsRackTryPlacing [123]

Client -> Server

Size Description Type Notes
2 X Int16 -
2 Y Int16 -
2 Net ID Int16 -
1 Prefix Byte -
2 Stack Int16 -

TEHatRackItemSync [124]

Client <-> Server

Size Description Type Notes
1 Player ID Byte -
4 TileEntityID Int32 -
1 Item Index Byte -
2 Item ID UInt16 -
2 Stack UInt16 -
1 Prefix Byte -

SyncTilePicking [125]

Client <-> Server

Size Description Type Notes
1 Player ID Byte -
2 X Int16 -
2 Y Int16 -
1 Pick Damage Byte -

SyncRevengeMarker [126]

Server -> Client

Size Description Type Notes
4 Unique ID Int32 -
4 X Single -
4 Y Single -
4 NPC ID Int32 -
4 NPC HP Percent Single -
4 NPC Type Int32 -
4 NPC AI Int32 -
4 Coin Value Int32 -
4 Base Value Single -
1 SpawnedFromStatue Boolean -

RemoveRevengeMarker [127]

Server -> Client

Size Description Type Notes
4 Unique ID Int32 -

LandGolfBallInCup [128]

Client <-> Server

Size Description Type Notes
1 Player ID Byte -
2 X UInt16 -
2 Y UInt16 -
2 Number of Hits UInt16 -
2 Proj ID UInt16 -

FinishedConnectingToServer [129]

Server -> Client

Size Description Type Notes

FishOutNPC [130]

Client -> Server

Size Description Type Notes
2 X UInt16 -
2 Y UInt16 -
2 NPC ID Int16 -

TamperWithNPC [131]

Server -> Client

Size Description Type Notes
2 NPC ID UInt16 -
1 SetNPCImmunity Byte -
4 Immunity Time Int32 Only sent if SetNPCImmunity flag is true
2 Immunity Player ID Int16 Set to -1 for immunity from all players

PlayLegacySound [132]

Server -> Client

Size Description Type Notes
4 X Single -
4 Y Single -
2 Sound ID UInt16 -
1 Sound Flags Byte BitFlags: 1 = Style, 2 = Volume Scale, 3 = Pitch Offset

FoodPlatterTryPlacing [133]

Client -> Server

Size Description Type Notes
2 X Int16 -
2 Y Int16 -
2 Item ID Int16 -
1 Prefix Byte -
2 Stack Int16 -

UpdatePlayerLuckFactors [134]

Client <-> Server

Size Description Type Notes
1 Player ID Byte -
4 Ladybug Luck Time Remaining Int32 -
4 Torch Luck Single -
1 Luck Potion Byte -
1 HasGardenGnomeNearby Boolean -

DeadPlayer [135]

Server -> Client

Size Description Type Notes
1 Player ID Byte -

SyncCavernMonsterType [136]

Client <-> Server

Size Description Type Notes
2 Net ID UInt16 NPC.cavernMonsterType[0,0]
2 Net ID UInt16 NPC.cavernMonsterType[0,1]
2 Net ID UInt16 NPC.cavernMonsterType[0,2]
2 Net ID UInt16 NPC.cavernMonsterType[1,0]
2 Net ID UInt16 NPC.cavernMonsterType[1,1]
2 Net ID UInt16 NPC.cavernMonsterType[1,2]

RequestNPCBuffRemoval [137]

Client -> Server

Size Description Type Notes
2 NPC ID Int16 -
2 Buff ID UInt16 -

ClientSyncedInventory [138]

Never sent

Size Description Type Notes

SetCountsAsHostForGameplay [139]

Server -> Client

Size Description Type Notes
1 Player ID Byte -
1 CountsAsHost Boolean -
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