diff --git a/dns.pack.js b/dns.pack.js
new file mode 100644
index 0000000..79e1f2f
--- /dev/null
+++ b/dns.pack.js
@@ -0,0 +1,25 @@
+(function (exports) {
+'use strict';
+
+var pdns = module.exports.DNS_PACK = function () {
+
+};
+
+pdns.packHeader = function(h) {
+  var val = 0;
+
+  val += (h.qr     << 15) & 0x8000;
+  val += (h.opcode << 11) & 0x7800;
+  val += (h.aa     << 10) &  0x400;
+  val += (h.tc     <<  9) &  0x200;
+  val += (h.rd     <<  8) &  0x100;
+  val += (h.ra     <<  7) &   0x80;
+  val += (h.res1   <<  6) &   0x40;
+  val += (h.res2   <<  5) &   0x20;
+  val += (h.res3   <<  4) &   0x10;
+  val += h.rcode          &    0xF;
+
+  return val;
+};
+
+}('undefined' !== typeof window ? window : exports));