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cidr

CLI application for basic operations with CIDR blocks based on https://github.com/open-policy-agent/opa

Installation

The easiest way to install cidr is via go install:

go install github.com/rjuer/cidr@latest

Your may also download the appropriate release for your platform from the releases page. Binaries are currently available for all combinations of [linux, darwin] and [amd64, arm64].

Usage

Currently, cidr can:

  • check if an IP address or CIDR block is contained in a particular CIDR block
  • expand a CIDR block to get all its IP addresses

To check if CIDR block 192.168.0.0/16 contains the IP address 192.168.7.42:

cidr contains 192.168.0.0/16 192.168.7.42

To check if CIDR block 192.168.0.0/16 contains the CIDR block 192.168.0.0/24:

cidr contains 192.168.0.0/16 192.168.0.0/24

To get all IP addressed within the CIDR block 192.168.0.0/24:

cidr expand 192.168.0.0/30