class option

[silverwind]

To do version queries, like:

var socket = require("dns-socket")();

socket.query({
  questions: [{
    type: "TXT",
    class: "CH",
    name: "version.bind"
  }]
}, 53, "4.2.2.2", function(err, res) {
  console.log(err, res);
});

I'd imagine support for these classes could be useful:

Class	Value
IN	0x0001
CH	0x0003
HS	0x0004
NONE	0x00FE
ANY	0x00FF