| Server IP : 93.115.150.27 / Your IP : 216.73.216.221 Web Server : LiteSpeed System : Linux host2.azar.host 4.18.0-553.80.1.lve.el8.x86_64 #1 SMP Wed Oct 22 19:29:36 UTC 2025 x86_64 User : dorfakkh ( 1797) PHP Version : 8.1.34 Disable Function : show_source, system, passthru, exec, popen, proc_open, mail MySQL : OFF | cURL : ON | WGET : ON | Perl : ON | Python : ON | Sudo : OFF | Pkexec : OFF Directory : /opt/alt/alt-nodejs14/root/lib/node_modules/npm/node_modules.bundled/is-cidr/ |
Upload File : |
# is-cidr
[](https://www.npmjs.org/package/is-cidr) [](https://www.npmjs.org/package/is-cidr)
> Check if a string is an IP address in CIDR notation
## Install
```
npm i is-cidr
```
## Usage
```js
const isCidr = require("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 address. 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 address. Returns a boolean.
### isCidr.v6(input)
Check if `input` is a IPv6 CIDR address. Returns a boolean.
## 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)