cidr-tools

cidr-tools

Tools to work with IPv4 and IPv6 CIDR network lists

Install

$ npm i cidr-tools

Example

const cidrTools = require('cidr-tools');

cidrTools.merge(['1.0.0.0/24', '1.0.1.0/24']); //=> ['1.0.0.0/23']
cidrTools.exclude(['::1/127'], ['::1/128']) //=> ['::/128']
cidrTools.expand(['2001:db8::/126']) //=> ['2001:db8::', '2001:db8::1', '2001:db8::2', '2001:db8::3']
cidrTools.overlap('1.0.0.0/24', '1.0.0.128/25') //=> true
cidrTools.normalize('0:0:0:0:0:0:0:0/0') //=> '::/0'

API

All functions take CIDR addresses or single IP addresses. On single addresses, a prefix of /32 or /128 is assumed. Function that return networks will return a merged and sorted set of networks with IPv4 sorted before IPv6.

cidrTools.merge(networks)

• networks String or Array: One or more CIDR or IP addresses.

Returns an array of merged networks.

cidrTools.exclude(baseNetworks, excludeNetworks)

• baseNetworks String or Array: One or more CIDR or IP addresses.
• excludeNetworks String or Array: One or more CIDR or IP addresses to exclude from baseNetworks.

Returns an array of merged remaining networks.

cidrTools.expand(networks)

• networks String or Array: One or more CIDR or IP addresses.

Returns an array of individual IPs contained in the networks.

cidrTools.overlap(networkA, networkB)

• networksA String or Array: One or more CIDR or IP address.
• networksB String or Array: One or more CIDR or IP address.

Returns a boolean that indicates if the networks A overlap (intersect) with networks B.

cidrTools.normalize(network)

• network String: A CIDR or IP address.

Returns a normalized representation of a IP or CIDR. Will not include a prefix on IPs.

© silverwind, distributed under BSD licence.