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cidr\n![GitHub release (latest SemVer)](https://img.shields.io/github/v/release/bschaatsbergen/cidr) [![Go Reference](https://pkg.go.dev/badge/github.com/bschaatsbergen/cidr.svg)](https://pkg.go.dev/github.com/bschaatsbergen/cidr)\n\nSimplifies IPv4/IPv6 CIDR network prefix management with counting, overlap checking, explanation, and subdivision.\n\n## Brew\nTo install cidr using brew, simply run:\n\n```sh\nbrew install cidr\n```\n\n## Debian (Trixie and newer) \u0026 Ubuntu (Oracular and newer)\nTo install cidr using apt, simply run:\n\n```sh\napt install cidr\n```\n\n## Binaries\nYou can download the [latest binary](https://github.com/bschaatsbergen/cidr/releases/latest) for Linux, MacOS, and Windows.\n\n\n## Examples\n\nUsing `cidr` is very simple.\n\n### Explain a CIDR range\n\nTo get more information on a CIDR range:\n\n```\n$ cidr explain 10.0.0.0/16\nBase Address:            10.0.0.0\nUsable Address Range:    10.0.0.1 to 10.0.255.254 (65,534)\nBroadcast Address:       10.0.255.255\nAddresses:               65,536\nNetmask:                 255.255.0.0 (/16 bits)\n```\n\nThis also works with IPv6 CIDR ranges, for example:\n\n```\n$ cidr explain 2001:db8:1234:1a00::/110\nBase Address:            2001:db8:1234:1a00::\nUsable Address Range:    2001:db8:1234:1a00:: to 2001:db8:1234:1a00::3:ffff (262,142)\nAddresses:               262,144\nNetmask:                 ffff:ffff:ffff:ffff:ffff:ffff:fffc:0 (/110 bits)\n```\n\n### Check whether an address belongs to a CIDR range\n\nTo check if a CIDR range contains an IP:\n\n```\n$ cidr contains 10.0.0.0/16 10.0.14.5\ntrue\n```\n\nThis also works with IPv6 addresses, for example:\n\n```\n$ cidr contains 2001:db8:1234:1a00::/106 2001:db8:1234:1a00::\ntrue\n```\n\n### Count\n\nTo get a count of all addresses in a CIDR range:\n\n```\n$ cidr count 10.0.0.0/16\n65536\n```\n\nThis also works with a IPv6 CIDR range, for example:\n\n```\n$ cidr count 2001:db8:1234:1a00::/106\n4194304\n```\n\nOr with a large prefix like a point-to-point link CIDR range:\n\n```\n$ cidr count 172.16.18.0/31\n2\n```\n\n### CIDR range intersection\n\nTo check if a CIDR range overlaps with another CIDR range:\n\n```\n$ cidr overlaps 10.0.0.0/16 10.0.14.0/22\ntrue\n```\n\nThis also works with IPv6 CIDR ranges, for example:\n\n```\n$ cidr overlaps 2001:db8:1111:2222:1::/80 2001:db8:1111:2222:1:1::/96\ntrue\n```\n\n### CIDR division\n\nTo divide a CIDR range into N distinct networks:\n\n```\n$ cidr divide 10.0.0.0/16 9\n10.0.0.0/20\n10.0.16.0/20\n10.0.32.0/20\n10.0.48.0/20\n10.0.64.0/20\n10.0.80.0/20\n10.0.96.0/20\n10.0.112.0/20\n10.0.128.0/20\n```\n\nThis also works with IPv6 CIDR ranges, for example:\n\n```\n$ cidr divide 2001:db8:1111:2222:1::/80 9\n2001:db8:1111:2222:1::/84\n2001:db8:1111:2222:1:1000::/84\n2001:db8:1111:2222:1:2000::/84\n2001:db8:1111:2222:1:3000::/84\n2001:db8:1111:2222:1:4000::/84\n2001:db8:1111:2222:1:5000::/84\n2001:db8:1111:2222:1:6000::/84\n2001:db8:1111:2222:1:7000::/84\n2001:db8:1111:2222:1:8000::/84\n```\n\n## Contributing\n\nContributions are highly appreciated and always welcome.\nHave a look through existing [Issues](https://github.com/bschaatsbergen/cidr/issues) and [Pull Requests](https://github.com/bschaatsbergen/cidr/pulls) that you could help with.\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fbschaatsbergen%2Fcidr","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fbschaatsbergen%2Fcidr","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fbschaatsbergen%2Fcidr/lists"}