IPLib

IPLib is a small library for working with IP addresses, subnets, masks. It's available in browser and in Node.js.

Preparing

In browser

<script src="ip.js"></script>

In Node.js

$ npm install iplib

var IP = require('iplib')

Examples:

Notes:

• All ip arguments expect valid ip (besides ip in parse(ip) and isIPv4(ip)).
• All mask arguments expect valid mask.

IP.parse(ip, [isSubnet])

> IP.parse('192.168.0.32')
{ ip: '192.168.0.32',
  mask: '255.255.255.0' }
> IP.parse('192.168.0.32', true)
{ ip: '192.168.0.32',
  mask: '255.255.255.224' }
> IP.parse('192.168.0.0', true)
{ ip: '192.168.0.0',
  mask: '255.255.255.0' }
> IP.parse('192.168.0.0/22', true)
{ ip: '192.168.0.0',
  mask: '255.255.252.0' }
> IP.parse('192.168.0.256')
null

isMask(ip)

> IP.isMask('255.255.255.0')
true
> IP.isMask('255.255.255.1')
false

IP.isValidMaskForSubnet(subnet, mask)

> IP.isValidMaskForSubnet('192.168.0.0', '255.255.255.0')
true
> IP.isValidMaskForSubnet('192.168.0.0', '255.0.0.0')
false

IP.isIpFromSubnet(subnet, mask, ip)

> IP.isIpFromSubnet('192.168.0.0', '255.255.255.0', '192.168.0.1')
true
> IP.isIpFromSubnet('192.168.0.0', '255.255.255.0', '192.168.0.0')
true
> IP.isIpFromSubnet('192.168.0.0', '255.255.255.0', '192.168.1.0')
false

IP.getNextIp(ip)

> IP.getNextIp('192.168.0.0')
'192.168.0.1'

IP.getMaskLength(mask)

> IP.getMaskLength('255.255.255.0')
24
> IP.getMaskLength('255.255.255.255')
32
> IP.getMaskLength('255.255.255.254')
31
> IP.getMaskLength('0.0.0.0')
0

IP.isIPv4(ip)

> IP.isIPv4('192.168.0.1')
true
> IP.isIPv4('192.168.0.256')
false
> IP.isIPv4('0.0.0.0')
true

IP.isIPv6(ip)

> IP.isIPv6('0.0.0.0')
false
> IP.isIPv6('1::1')
true