phpjs/functions/network/inet_ntop.js

php.js offers community built php functions in javascript

function inet_ntop(a) {
  //  discuss at: http://phpjs.org/functions/inet_ntop/
  // 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;
  }
}