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# is-cidr
Check if a string is a valid CIDR
[](https://github.com/semantic-release/semantic-release)
[](http://npm.im/is-cidr)
[](http://opensource.org/licenses/MIT)
[](https://travis-ci.org/flipjs/is-cidr)
[](https://github.com/feross/standard)
[](http://commitizen.github.io/cz-cli/)
[](http://npm-stat.com/charts.html?package=is-cidr&from=2016-03-24)
## Install
```sh
$ npm install --save is-cidr
```
## Usage
```js
import isCidr from 'is-cidr' // default is isCidrV4
import { isCidrV4, isCidrV6 } from 'is-cidr'
// OR
var isCidrV4 = require('is-cidr').isCidrV4
var isCidrV6 = require('is-cidr').isCidrV6
// is a CIDR v4
isCidr('18.101.25.153/24') // true
// is not a CIDR v4
isCidrV4('999.999.999.999/12') // false
// is a CIDR v6
isCidrV6('fe80:0000:0000:0000:0204:61ff:fe9d:f156') // true
// is not a CIDR v6
isCidrV6('fe80:0000:0000:0000:0204:61ff:fe9d:f156/a') // false
```
## API
### isCidr(string)
Check if a string is CIDR IPv4.
### isCidrV4(string)
Check if a string is CIDR IPv4.
### isCidrV6(string)
Check if a string is CIDR IPv6.
## License
MIT © [Felipe Apostol](https://github.com/flipjs)