mikrotik-duckdns-updater

# Mikrotik script to update DuckDNS.org domain, to use it:   
#  - Download it as `duckdns-update`
#  - Tune your `duckToken` and `duckDomain` variables
#  - Copy it to your router:
#     `scp duckdns-update user@you-router:`
#  - Add the script
#     `/system script add name=duckdns-update source=[ /file get duckdns-update contents ]`
#  - Add a periodic task to execute it
#     `/system scheduler add name=duckdns-updater interval=1h on-event=duckdns-update`
#  - Or execute it manully
#     `/system script run duckdns-update`
 
# Set needed variables
:local duckToken "your-token-uuid"
:local duckDomain "examplesubdomain"
 
:global previousIP
 
:log info ("DuckDNS: Check")
/tool fetch mode=http address="whatismyip.akamai.com" host="whatismyip.akamai.com" src-path="/" dst-path=/ip.txt
:local externalIP [/file get ip.txt contents]
 
:if ($externalIP != $previousIP) do={
    :set previousIP $externalIP
    /tool fetch mode=https url="https://www.duckdns.org/update?domains=$duckDomain&token=$duckToken&ip=$externalIP" dst-path=duckdns.txt;
    :local result [/file get duckdns.txt contents];
    :log info "Duck DNS update result: $result";
} else={
    :log info ("DuckDNS: IP not changed")
}

/system script duckdns-update run should be modified like /system script run duckdns-update.
Thank you for sharing a good script.

/system script duckdns-update run should be modified like /system script run duckdns-update.
Thank you for sharing a good script.

Yes! for the advise :D

Thank you. At last I found a working one.!

here is a bit more advanced variant
https://github.com/beeyev/Mikrotik-Duckdns-Dynamic-IP-Updater