diff --git a/dns.classes.js b/dns.classes.js
index c0f5463..d758503 100644
--- a/dns.classes.js
+++ b/dns.classes.js
@@ -1,8 +1,12 @@
 (function (exports) {
 'use strict';
 
-exports.DNS_CLASSES = {
+var classes = exports.DNS_CLASSES = {
   IN:   0x01  //   1
 };
+// and in reverse
+Object.keys(classes).forEach(function (key) {
+  classes[classes[key]] = key;
+});
 
 }('undefined' !== typeof window ? window : exports));
diff --git a/dns.types.js b/dns.types.js
index 95aa872..7323e4f 100644
--- a/dns.types.js
+++ b/dns.types.js
@@ -1,7 +1,7 @@
 (function (exports) {
 'use strict';
 
-exports.DNS_TYPES = {
+var types = exports.DNS_TYPES = {
   A: 			0x01	//   1
 , NS: 		0x02  //   2
 , CNAME: 	0x05  //   5
@@ -13,5 +13,9 @@ exports.DNS_TYPES = {
 , SRV: 		0x21  //  33
 , ANY: 		0xff  // 255
 };
+// and in reverse
+Object.keys(types).forEach(function (key) {
+  types[types[key]] = key;
+});
 
 }('undefined' !== typeof window ? window : exports));