CLI to perform various actions on CIDR ranges
To install cidr using brew, simply run:
brew install cidrYou can download the latest binary for Linux, MacOS, and Windows.
Using cidr is very simple.
To get more information on a CIDR range:
$ cidr explain 10.0.0.0/16
Base Address: 10.0.0.0
Usable Address Range: 10.0.0.1 to 10.0.255.254
Broadcast Address: 10.0.255.255
Address Count: 65,534
Netmask: 255.255.0.0 (/16 bits)
This also works with IPv6 CIDR ranges, for example:
$ cidr explain 2001:db8:1234:1a00::/64
Base Address: 2001:db8:1234:1a00::
Usable Address Range: 2001:db8:1234:1a00:: to 2001:db8:1234:1a00:ffff:ffff:ffff:ffff
Address Count: 18,446,744,073,709,551,614
Netmask: ffff:ffff:ffff:ffff:: (/64 bits)
To check if a CIDR range contains an IP:
$ cidr contains 10.0.0.0/16 10.0.14.5
true
This also works with IPv6 addresses, for example:
$ cidr contains 2001:db8:1234:1a00::/106 2001:db8:1234:1a00::
true
To get all distinct host addresses part of a given CIDR range:
$ cidr count 10.0.0.0/16
65534
This also works with a IPv6 CIDR range, for example:
$ cidr count 2001:db8:1234:1a00::/106
4194302
Or with a large prefix like a point-to-point link CIDR range:
$ cidr count 172.16.18.0/31
2
To check if a CIDR range overlaps with another CIDR range:
$ cidr overlaps 10.0.0.0/16 10.0.14.0/22
true
This also works with IPv6 CIDR ranges, for example:
$ cidr overlaps 2001:db8:1111:2222:1::/80 2001:db8:1111:2222:1:1::/96
true
Contributions are highly appreciated and always welcome. Have a look through existing Issues and Pull Requests that you could help with.