ip-address is a library for validating and manipulating IPv4 and IPv6 addresses in JavaScript.

ip-address was rewritten in TypeScript for version 7. If you were using version 6 you'll need to make these changes to upgrade:

• Instead of checking isValid(), which has been removed, you'll need to use a try/catch if you're accepting unknown input. This made the TypeScript types substantially easier as well as allowed the use of an AddressError class which will contain a parseMessage if an error occurred in the parsing step.
• Instead of using the error, parseError, and valid attributes you'll need to use the message and parseMessage of the thrown AddressError.

Documentation is available at ip-address.js.org.

var Address6 = require('ip-address').Address6;

var address = new Address6('2001:0:ce49:7601:e866:efff:62c3:fffe');

var teredo = address.inspectTeredo();

teredo.client4;    // '157.60.0.1'

• Usable via CommonJS or ESM
• Parsing of all IPv6 notations
• Parsing of IPv6 addresses and ports from URLs with Address6.fromURL(url)
• Validity checking
• Decoding of the Teredo information in an address
• Whether one address is a valid subnet of another
• What special properties a given address has (multicast prefix, unique local address prefix, etc.)
• Number of subnets of a certain size in a given address
• Display methods
  • Hex, binary, and decimal
  • Canonical form
  • Correct form
  • IPv4-compatible (i.e. ::ffff:192.168.0.1)
• Works in node and the browser (with browserify)
• ~1,600 test cases

• anon which powers @congressedits, among many others
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• contrail-web-core: part of Contrail, a network virtualization solution made by Juniper Networks
• dhcpjs: a DHCP client and server
• epochtalk: next generation forum software
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• hexabus: an IPv6-based home automation bus
• hubot-deploy: GitHub Flow via hubot
• heroku-portscanner: nmap hosted on Heroku
• ipfs-swarm: a swarm implementation based on IPFS
• javascript-x-server: an X server written in JavaScript
• libnmap: a node API for nmap
• mail-io: a lightweight SMTP server
• maxmind-db-reader: a library for reading MaxMind database files
• proxy-protocol-v2: a proxy protocol encoder/decoder built by Ably
• Samsara: a Docker web interface
• sis-api: a configuration management database API
• socks5-client: a SOCKS v5 client
• socksified: a SOCKS v5 client
• socksv5: a SOCKS v5 server/client
• ssdapi: an API created by the University of Portsmouth
• SwitchyOmega: a Chrome extension for switching between multiple proxies with ~311k users!
• swiz: a serialization framework built and used by Rackspace