ipop

IP subnet calculator. One can also use it to check if IP is in subnet.

Install

npm install ipop

Usage

Example

var ipop = require('ipop');

// check if IP in subnet
console.log(ipop.ip4incidr('192.168.1.15', '192.168.0.1/24'));
console.log(ipop.ip4incidr('192.168.1.15', '192.168.0.1/16'));
console.log(ipop.ip4incidr('192.168.1.15', '192.168.1.15/32'));

// show subnet info
console.log(ipop.cidr4('87.239.88.1/22'));

Output:

false
true
true
{ net: '87.239.88.0',
  netmask: '255.255.252.0',
  broadcast: '87.239.91.255',
  low: '87.239.88.1',
  high: '87.239.91.254',
  hosts: 1022 }

Documentation

ip4incidr(ip, cidr)

check if ip is in given cidr. Returns boolean. cidr has to be in format X.X.X.X/X.

cidr4(cidr)

cidr4 returns object with info about given cidr:

• net: network address
• netmask: network mask
• broadcast: broadcast address
• low: first usable host address
• high: last usable host address
• hosts: number of usable hosts