@se-oss/ip-address

@se-oss/ip-address

@se-oss/ip-address is a modern, immutable, and zero-dependency library for working with IPv4 and IPv6 addresses in JavaScript and TypeScript.

• Installation
• Usage
• Documentation
• Contributing
• License

📦 Installation

npm install @se-oss/ip-address

Install using your favorite package manager

pnpm

pnpm install @se-oss/ip-address

yarn

yarn add @se-oss/ip-address

📖 Usage

This library makes working with IP addresses a breeze. Here are a few common scenarios:

Parsing and Validation

You can easily parse any IP address string. The library will automatically figure out the version and throw an error if the address is invalid.

import { IPv4, IPv6, parseIP } from '@se-oss/ip-address';

// Let the factory do the work
const ip = parseIP('192.168.1.1'); // Returns an IPv4 instance
const ip6 = parseIP('2001:db8::1'); // Returns an IPv6 instance

console.log(ip.version); // 4
console.log(ip6.version); // 6

// Or validate without creating an instance
if (IPv4.isValid('10.0.0.1')) {
  console.log('Yep, a valid IPv4 address.');
}

try {
  parseIP('not.an.ip');
} catch (error) {
  console.error(error.message); // "Invalid IP address: not.an.ip"
}

Working with IPv4 Addresses

Once you have an IPv4 instance, you can perform all sorts of checks and conversions.

import { IPv4 } from '@se-oss/ip-address';

const ip = new IPv4('192.168.1.1');

// Check its type
console.log(ip.isPrivate()); // true
console.log(ip.isLoopback()); // false

// Convert it
console.log(ip.toBigInt()); // 3232235777n
console.log(ip.toBytes()); // [192, 168, 1, 1]
console.log(ip.toArpa()); // "1.1.168.192.in-addr.arpa"

// Get the next IP
const nextIp = ip.next();
console.log(nextIp.address); // "192.168.1.2"

Working with IPv6 Addresses

IPv6 is just as easy, with full support for its unique features.

import { IPv6 } from '@se-oss/ip-address';

const ip6 = new IPv6('2001:db8::8a2e:370:7334');

// Get compressed vs. expanded address
console.log(ip6.address); // "2001:db8::8a2e:370:7334"
console.log(ip6.expandedAddress); // "2001:0db8:0000:0000:0000:8a2e:0370:7334"

// Check its type
console.log(ip6.isGlobalUnicast()); // true
console.log(ip6.isLinkLocal()); // false

// Handle IPv4-mapped addresses
const mappedIp = new IPv6('::ffff:192.168.1.1');
console.log(mappedIp.isIPv4Mapped()); // true
const ipv4 = mappedIp.toIPv4();
console.log(ipv4.address); // "192.168.1.1"

Handling CIDR Blocks

Need to work with subnets? The CIDR class has you covered.

import { CIDR } from '@se-oss/ip-address';

const cidr = new CIDR('10.0.0.0/24');

// Get network details
console.log(cidr.network.address); // "10.0.0.0"
console.log(cidr.broadcast.address); // "10.0.0.255"
console.log(cidr.first.address); // "10.0.0.1"
console.log(cidr.last.address); // "10.0.0.254"

// Check if an IP falls within the range
console.log(cidr.contains('10.0.0.123')); // true
console.log(cidr.contains('10.0.1.1')); // false

📚 Documentation

For all configuration options, please see the API docs.

🤝 Contributing

Want to contribute? Awesome! To show your support is to star the project, or to raise issues on GitHub

Thanks again for your support, it is much appreciated! 🙏

License

MIT © Shahrad Elahi and contributors.