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# 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://api.travis-ci.org/silverwind/is-cidr.svg?style=flat)](https://travis-ci.org/silverwind/is-cidr)
> Check if a string is an IP address in CIDR notation
## Install
```
$ npm install --save is-cidr
```
## Usage
```js
const isCidr = require('is-cidr');
isCidr('192.168.0.1/24');
//=> true
isCidr('1:2:3:4:5:6:7:8/64');
//=> true
isCidr.v4('1:2:3:4:5:6:7:8/64');
//=> false
```
## API
### isCidr(input)
Check if `input` is a IPv4 or IPv6 CIDR address.
### isCidr.v4(input)
Check if `input` is a IPv4 CIDR address.
### isCidr.v6(input)
Check if `input` is a IPv6 CIDR address.
## Related
- [cidr-regex](https://github.com/silverwind/cidr-regex) - Regular expression for matching IP addresses in CIDR notation
- [is-ip](https://github.com/sindresorhus/is-ip) - Check if a string is an IP address
- [ip-regex](https://github.com/sindresorhus/ip-regex) - Regular expression for matching IP addresses
## License
© [silverwind](https://github.com/silverwind), distributed under BSD licence
Based on previous work by [Felipe Apostol](https://github.com/flipjs)
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