ip-root.js

// mimic our ip_root sql function
exports.ipRoot = (function () {
  const {Address4, Address6} = require('ip-address')
  return function (str) {
    let ip = new Address6(str)
    if (ip.v4 && !ip.valid) {
      // it is v4
      ip = new Address4(str)
      return Address4.fromInteger(Number.parseInt(_.padEnd(ip.mask(24), 32, '0'), 2)).correctForm()
    }

    // not an ip
    if (!ip.valid) return

    // must be ipv6
    const fakeBigint = Number.parseInt(_.padEnd(ip.mask(48), 128, '0'), 2)
    return Address6.fromBigInteger(fakeBigint).correctForm()
  }
})()