inet_aton, inet_ntoa, ip2int, int2ip

inet_aton_ntoa.js

function inet_aton(a) {
  return a.split(".").reduce(function(a, b) {
    return (a << 8) + parseInt(b, 10);
  }, 0) >>> 0;
}

function inet_ntoa(a) {
  return (a >>> 24) + "." + (a >> 16 & 255) + "." + (a >> 8 & 255) + "." + (a & 255);
}