Skip to content

Instantly share code, notes, and snippets.

@josephgoksu

josephgoksu/cidr-calculation.md

Created April 27, 2022 18:53
Show Gist options
  • Star 0 You must be signed in to star a gist
  • Fork 0 You must be signed in to fork a gist
  • Save josephgoksu/31d67cfa1b00ffdcc2c79d7dbc431cda to your computer and use it in GitHub Desktop.
Save josephgoksu/31d67cfa1b00ffdcc2c79d7dbc431cda to your computer and use it in GitHub Desktop.
Download ZIP
Raw
cidr-calculation.md

For 10.0.0.0/16, we can create subnets between 10.0.0.0/24 to 10.0.255.0/24, e.g. 10.0.8.0/24 would work.

Let's say we've got CIDR address 10.20.30.40 - that can fall for example into these subnets:

10.0.0.0/8 - /8 means only the first byte (10.) in the address is the network address.
10.20.0.0/16 - /16 means the first two bytes (10.20.) are network.
10.20.30.0/24 - /24 means the first three bytes (10.20.30.) are network.
10.20.30.40/32 - /32 covers the whole address (10.20.30.40) and sometimes this notation is used to explicitly say it's a host address. AWS uses that a lot.
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment