cidr2ip

This program converts IPv4 CIDR blocks into their constituent IP addresses.

Input modes

1. Commnd line arguments

code@express:~$ cidr2ip 10.0.0.0/30 192.68.0.0/30
10.0.0.0
10.0.0.1
10.0.0.2
10.0.0.3
192.68.0.0
192.68.0.1
192.68.0.2
192.68.0.3

2. Piped input

code@express:~$ cat cidrs.txt | cidr2ip
127.0.0.1
192.168.0.100
192.168.0.101
192.168.0.102
192.168.0.103
10.0.0.0
10.0.0.1
10.0.0.2
10.0.0.3
10.0.0.4
10.0.0.5
10.0.0.6
10.0.0.7

3. File input

code@express:~$ cidr2ip -i cidrs.txt
127.0.0.1
192.168.0.100
192.168.0.101
192.168.0.102
192.168.0.103
10.0.0.0
10.0.0.1
10.0.0.2
10.0.0.3
10.0.0.4
10.0.0.5
10.0.0.6
10.0.0.7

4. File output

code@express:~$ cidr2ip -i cidrs.txt -o results.txt
code@express:~$ cat results.txt
127.0.0.1
192.168.0.100
192.168.0.101
192.168.0.102
192.168.0.103
10.0.0.0
10.0.0.1
10.0.0.2
10.0.0.3
10.0.0.4
10.0.0.5
10.0.0.6
10.0.0.7

Install

Use go install

If you have golang tools installed, you can download and build the source code locally as follows:

go install github.com/codeexpress/cidr2ip@latest

Download from the releases pages

Download pre-built binary from the releases page. Rename it to cidr2ip. Optionally, add it to your PATH to be able to invoke cidr2ip from any directory without specifying the full path to binary.