codeexpress/cidr2ip

Convert CIDR blocks to constituent IP addresses

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
10.0.0.1
10.0.0.2
192.68.0.1
192.68.0.2

The -r flag outputs IP ranges seperated by hyphen.

code@express:~$ cidr2ip -r 10.0.0.0/30 192.68.0.0/30
10.0.0.1-10.0.0.2
192.68.0.1-192.68.0.2

2. Piped input

code@express:~$ cat cidrs.txt | cidr2ip
192.168.0.101
192.168.0.102

3. File input

code@express:~$ cidr2ip -f cidrs.txt
192.168.0.101
192.168.0.102

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.

cidr2ip's Issues

IP Range instead of singles IP option?

Excellent work but have a suggestion and that is to have an option to have the ip ranges like
192.168.0.0-192.168.255.255 instead of been 192.168.0.0 192.168.0.1 192.168.0.2 etc

Math is off

Sorry but your math is off - please verify the results your script outputs with any other CIDR to IP range calculator including what should be considered the official, Arin. https://account.arin.net/public/cidrCalculator

help

I have a list of in this format :
1.58.76.0-2.58.79.255
1.59.12.0-2.59.15.255
1.1.79.0-5.1.79.255

i want transform in this format :
1.58.76.01
1.58.76.02
....
2.58.79.255
...
1.59.12.1
1.59.12.2
1.59.12.3
...
2.59.15.255

how i run , ?