is-loopback-addr

Check if a IP address is a loopback address

Various Internet Engineering Task Force (IETF) standards reserve the IPv4 address block 127.0.0.0/8 and the IPv6 address ::1/128 for this purpose. The most common IPv4 address used is 127.0.0.1. Commonly these loopback addresses are mapped to the hostnames, localhost or loopback. For more information check rfc5735 and rfc3513.

Install

npm i is-loopback-addr

Usage

import { isLoopbackAddr } from 'is-loopback-addr'

console.log(isLoopbackAddr('127.0.0.1')) // true
console.log(isLoopbackAddr('192.168.0.1')) // false
console.log(isLoopbackAddr('22.2.0.1')) // false
console.log(isLoopbackAddr('::1')) // true
console.log(isLoopbackAddr('2001:8a0:7ac5:4201:3ac9:86ff:fe31:7095')) // false

Contribute

Feel free to dive in! Open an issue or submit PRs.

License

MIT © Vasco Santos