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"readme": "# is-cidr\n\n[](https://www.npmjs.org/package/is-cidr) [](https://www.npmjs.org/package/is-cidr) [](https://travis-ci.org/silverwind/is-cidr)\n\n> Check if a string is an IP address in CIDR notation\n\n## Install\n\n```\nnpm i is-cidr\n```\n\n\n## Usage\n\n```js\nconst isCidr = require('is-cidr');\n\nisCidr('192.168.0.1/24'); //=> 4\nisCidr('1:2:3:4:5:6:7:8/64'); //=> 6\nisCidr('10.0.0.0'); //=> 0\nisCidr.v6('10.0.0.0/24'); //=> false\n```\n\n\n## API\n\n### isCidr(input)\n\nCheck 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.\n\n### isCidr.v4(input)\n\nCheck if `input` is a IPv4 CIDR address. Returns a boolean.\n\n### isCidr.v6(input)\n\nCheck if `input` is a IPv6 CIDR address. Returns a boolean.\n\n\n## Related\n\n- [cidr-regex](https://github.com/silverwind/cidr-regex) - Regular expression for matching IP addresses in CIDR notation\n- [is-ip](https://github.com/sindresorhus/is-ip) - Check if a string is an IP address\n- [ip-regex](https://github.com/sindresorhus/ip-regex) - Regular expression for matching IP addresses\n\n## License\n\n© [silverwind](https://github.com/silverwind), distributed under BSD licence\n\nBased on previous work by [Felipe Apostol](https://github.com/flipjs)\n",
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