How to convert a hyphenated IP range to CIDR in Node.js?

Question

I have a hyphenated IP range, and I need to convert it to CIDR notation, for example:

input: 70.103.242.28-70.103.242.30 output: 70.103.242.28/31, 70.103.242.30/32

Python has a library for it (ipaddress):

cidr = ipaddress.summarize_address_range(start_ip, end_ip)

Looking for something similar in Node.js, but unable to find it. I would rather use a library for it than implement it on my own. Looked into netmask, ip-cidr, ip6, ip libraries, but it doesn't look like any of those support it.

Answer 1

I think you need to use ip-subnet-calculator module:

const SubnetCalculator = require('ip-subnet-calculator');

const ipRange = '192.168.0.1-192.168.0.10';
const [startIp, endIp] = ipRange.split('-');

const subnet = SubnetCalculator.calculate(startIp, endIp);
console.log(subnet);

Output:

[
    {
        ipLow: 3232235521,
        ipLowStr: "192.168.0.1",
        ipHigh: 3232235521,
        ipHighStr: "192.168.0.1",
        prefixMask: 4294967295,
        prefixMaskStr: "255.255.255.255",
        prefixSize: 32,
        invertedMask: 0,
        invertedMaskStr: "0.0.0.0",
        invertedSize: 0
    },
    // ...
]