IPCheck

Quickly parses IP addresses, allowing them to be checked for CIDR matches.

Converts IPv4 to IPv6 to keep the process seamless and allow transitional IPs.

Install

npm install ipcheck --save

Usage

Quick

To easily check an IP and a CIDR without any extra thrills...

var IPCheck = require('ipcheck');
IPCheck.match('192.168.0.1', '192.168.0.1/32'); //= true

Ordinary

Allows you to individually validate and re-use different IPs.

var IPCheck = require('ipcheck');
var ip = new IPCheck('192.168.0.1');
var cidr = new IPCheck('192.168.0.1/32');
 
ip.match(cidr); //= true

IPv6

Works seamlessly!

IPCheck.match('FE80:0000:0000:0000:0202:B3FF:FE1E:8329', 'FE80:0000:0000:0000:0202:B3FF:FE1E:8329/128'); //= true

IPv4 and IPv6 transitional

As all IPv4 addresses are converted to IPv6, transitional IPs are supported.

var ip = new IPCheck('192.168.0.1');
var ipv4cidr = new IPCheck('192.168.0.1/32');
var ipv6cidr = new IPCheck('::ffff:192.168.0.1/128');
ip.match(ipv4cidr); //= true
ip.match(ipv6cidr); //= true

To convert a CIDR from IPv4 to IPv6, the mask simply has 96 added to it.

Invalid IPs/errors

IPCheck is designed to not throw errors.

If you'd like to know an address is valid, simply read the valid property...

var ip = new IPCheck('192.168.0.1');
ip.valid; //= true
 
var badIP = new IPCheck([ 'huh?' ]);
badIP.valid; //= false
 
var anotherBadIP = new IPCheck('silly.ip');
anotherBadIP.valid; //= false
 
// Match always returns false if either the IP or the CIDR are invalid
IPCheck.match('hi', 'oh/no');

Other

Benchmarks

npm run benchmark - simply compares this to ipaddr.js and ip-address modules in places. The TL;DR of it is that ipcheck is reliably faster.

Tests

npm test - ensure everything works!