phpjs/functions/network/ip2long.js

php.js offers community built php functions in javascript

function ip2long(IP) {
  // From: http://phpjs.org/functions
  // +   original by: Waldo Malqui Silva
  // +   improved by: Victor
  // +    revised by: fearphage (http://http/my.opera.com/fearphage/)
  // +    revised by: Theriault
  // *     example 1: ip2long('192.0.34.166');
  // *     returns 1: 3221234342
  // *     example 2: ip2long('0.0xABCDEF');
  // *     returns 2: 11259375
  // *     example 3: ip2long('255.255.255.256');
  // *     returns 3: false
  var i = 0;
  // PHP allows decimal, octal, and hexadecimal IP components.
  // PHP allows between 1 (e.g. 127) to 4 (e.g 127.0.0.1) components.
  IP = IP.match(/^([1-9]\d*|0[0-7]*|0x[\da-f]+)(?:\.([1-9]\d*|0[0-7]*|0x[\da-f]+))?(?:\.([1-9]\d*|0[0-7]*|0x[\da-f]+))?(?:\.([1-9]\d*|0[0-7]*|0x[\da-f]+))?$/i); // Verify IP format.
  if (!IP) {
    return false; // Invalid format.
  }
  // Reuse IP variable for component counter.
  IP[0] = 0;
  for (i = 1; i < 5; i += 1) {
    IP[0] += !! ((IP[i] || '').length);
    IP[i] = parseInt(IP[i]) || 0;
  }
  // Continue to use IP for overflow values.
  // PHP does not allow any component to overflow.
  IP.push(256, 256, 256, 256);
  // Recalculate overflow of last component supplied to make up for missing components.
  IP[4 + IP[0]] *= Math.pow(256, 4 - IP[0]);
  if (IP[1] >= IP[5] || IP[2] >= IP[6] || IP[3] >= IP[7] || IP[4] >= IP[8]) {
    return false;
  }
  return IP[1] * (IP[0] === 1 || 16777216) + IP[2] * (IP[0] <= 2 || 65536) + IP[3] * (IP[0] <= 3 || 256) + IP[4] * 1;
}