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

The dependency on jsbn was removed thanks to michal-kocarek. Thanks Michal! For clarity, all methods with BigInteger in the name were renamed to BigInt.

• #fromBigInteger() → #fromBigInt(); now returns a native BigInt
• #bigInteger() → #bigInt(); now returns a native BigInt

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
• base85: base85 encoding/decoding
• 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
• geoip-web: a server for quickly geolocating IP addresses
• 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