phpjs/functions/network/inet_ntop.js

php.js offers community built php functions in javascript

function inet_ntop(a) {
  // From: http://phpjs.org/functions
  // +   original by: Theriault
  // *     example 1: inet_ntop('\x7F\x00\x00\x01');
  // *     returns 1: '127.0.0.1'
  // *     example 2: inet_ntop('\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1');
  // *     returns 2: '::1'
  var i = 0,
      m = '',
      c = [];
  a += '';
  if (a.length === 4) { // IPv4
    return [
      a.charCodeAt(0), a.charCodeAt(1), a.charCodeAt(2), a.charCodeAt(3)].join('.');
  } else if (a.length === 16) { // IPv6
    for (i = 0; i < 16; i++) {
      c.push(((a.charCodeAt(i++) << 8) + a.charCodeAt(i)).toString(16));
    }
    return c.join(':').replace(/((^|:)0(?=:|$))+:?/g, function(t) {
      m = (t.length > m.length) ? t : m;
      return t;
    }).replace(m || ' ', '::');
  } else { // Invalid length
    return false;
  }
}