https://github.com/silverwind/is-cidr

Check if a string is an IP address in CIDR notation
https://github.com/silverwind/is-cidr

cidr ip javascript module nodejs

Last synced: 10 days ago
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Check if a string is an IP address in CIDR notation

• Host: GitHub
• URL: https://github.com/silverwind/is-cidr
• Owner: silverwind
• Created: 2016-03-25T07:20:59.000Z (over 8 years ago)
• Default Branch: master
• Last Pushed: 2024-04-13T18:54:11.000Z (7 months ago)
• Last Synced: 2024-04-14T08:56:28.642Z (7 months ago)
• Topics: cidr, ip, javascript, module, nodejs
• Language: JavaScript
• Homepage:
• Size: 1.28 MB
• Stars: 32
• Watchers: 3
• Forks: 5
• Open Issues: 1
• Metadata Files:
  • Readme: README.md

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README

        
# is-cidr

[![](https://img.shields.io/npm/v/is-cidr.svg?style=flat)](https://www.npmjs.org/package/is-cidr) [![](https://img.shields.io/npm/dm/is-cidr.svg)](https://www.npmjs.org/package/is-cidr) [![](https://packagephobia.com/badge?p=is-cidr)](https://packagephobia.com/result?p=is-cidr)

> Check if a string is an IP address in CIDR notation

## Install

```

npm i is-cidr

```

## Usage

```js

import isCidr from "is-cidr";

isCidr("192.168.0.1/24"); //=> 4

isCidr("1:2:3:4:5:6:7:8/64"); //=> 6

isCidr("10.0.0.0"); //=> 0

isCidr.v6("10.0.0.0/24"); //=> false

```

## API

### isCidr(input)

Check if `input` is a IPv4 or IPv6 CIDR. Returns either `4`, `6` (indicating the IP version) or `0` if the string is not a CIDR.

### isCidr.v4(input)

Check if `input` is a IPv4 CIDR. Returns a boolean.

### isCidr.v6(input)

Check if `input` is a IPv6 CIDR. Returns a boolean.

## Related

- [ip-bigint](https://github.com/silverwind/ip-bigint) - Convert IPv4 and IPv6 addresses to native BigInt and vice-versa

- [ip-regex](https://github.com/sindresorhus/ip-regex) - Regular expression for matching IP addresses

- [is-ip](https://github.com/sindresorhus/is-ip) - Check if a string is an IP address

- [cidr-regex](https://github.com/silverwind/cidr-regex) - Check if a string is an IP address in CIDR notation

- [cidr-tools](https://github.com/silverwind/cidr-tools) - Tools to work with IPv4 and IPv6 CIDR network lists

## License

© [silverwind](https://github.com/silverwind), distributed under BSD licence

Based on previous work by [Felipe Apostol](https://github.com/flipjs)