@cldn/ip

IP address utility.

Features

• Works in the browser and in Node.js without any polyfills. (A bundler like Webpack or Vite is recommended for the browser)
• IPv4 and IPv6 classes.
• Get IP address as BigInt, binary or string.
• Extract IPv4-mapped IPv6 addresses.
• Subnet class with methods to check IP membership, create netmask, list addresses, etc.
• Network class for working with multiple subnets.
• Written in TypeScript.

See the Documentation

Installation

npm install @cldn/ip
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Usage

import {IPv4, IPv6, Subnet} from "@cldn/ip";

const ipv6 = IPv4.fromString("::ffff:192.168.1.42");
const ipv4 = ipv6.getMappedIPv4();

const subnet = Subnet.fromString("192.168.0.0/16");
subnet.has(ipv4); // true
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Licence

Copyright © 2024–2025 Cloudnode OÜ

This file is part of @cldn/ip.

@cldn/ip is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

@cldn/ip is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.