Usage no npm install needed!

<script type="module">
  import martianCidr from 'https://cdn.skypack.dev/martian-cidr';
</script>

README

Martian CIDR

Check if an IP address is from reserved subnet.

Certain IP subnets are reserved for special-use by Internet Assigned Numbers Authority (IANA). A Martian packet is an IP packet which specifies a source or destination address from such subnet. If seen on the public internet, these packets cannot actually originate as claimed, or be delivered.

You can check if some packet is a Martian packet like that:

import isMartianIP from 'martian-cidr'
console.log(isMartianIP('10.0.0.1')) // true

Version 2.0.0 introduces a breaking change: the support for CommonJS is removed, minimal Node.js version becomes 14.

npm install --save martian-cidr

npm run test