netaddr.js

Node.js utility package for working with IP addresses and CIDR ranges.

Installation

$ npm install netaddr --save

Usage

var Addr = require('netaddr').Addr;

// Create a fixed IP address from a string
var localhost = Addr('127.0.0.1');

// Create  CIDR range from a string
var subnet = Addr('10.0.0.0/16');

// Create a CIDR range from an integer and prefix
var subnet = Addr(167772160, 16);

// Convert an IP address to an integer
var intval = Addr('127.0.0.1').toInt();

// Get the network address
var network = subnet.network();

// Get the broadcast address
var broadcast = subnet.broadcast();

// Mask the address with a new prefix
var masked = subnet.mask(24);

// Check if one CIDR contains another CIDR or IP
subnet.contains(Addr('10.0.3.0/24')); // true

// Check where two CIDRs intersect
subnet.intersect(Addr('10.0.3.0/24'));

// Increment an address (non-mutating)
localhost.increment();

// Decrement an address (non-mutating)
localhost.decrement();

// Find the next adjacent subnet
subnet.nextSibling();

// Find the previous adjacent subnet
subnet.prevSibling();

Attempts to create an invalid Addr will throw an Error.

Limitations

Currently only IPv4 is supported, though there are plans to add IPv6 support. This is complicated by the fact JavaScript does not support 64-bit integers, let alone 128-bit integers.

Copyright & License

Copyright © 2015 Chris Corbyn. See the LICENSE file for details.