diff --git a/index.js b/index.js
index be85d48..b66e442 100644
--- a/index.js
+++ b/index.js
@@ -1,4 +1,5 @@
 var types = require('./types')
+var rcodes = require('./rcodes')
 var ip = require('ip')
 var Buffer = require('safe-buffer').Buffer
 
@@ -126,6 +127,15 @@ header.decode = function (buf, offset) {
     id: buf.readUInt16BE(offset),
     type: flags & RESPONSE_FLAG ? 'response' : 'query',
     flags: flags & 32767,
+    opcode: (flags >> 11) & 0xf,
+    flag_auth: (flags >> 10) & 0x1,
+    flag_trunc: (flags >> 9) & 0x1,
+    flag_rd: (flags >> 8) & 0x1,
+    flag_ra: (flags >> 7) & 0x1,
+    flag_z: (flags >> 6) & 0x1,
+    flag_ad: (flags >> 5) & 0x1,
+    flag_cd: (flags >> 4) & 0x1,
+    rcode: rcodes.toString(flags & 0xf),
     questions: new Array(buf.readUInt16BE(offset + 4)),
     answers: new Array(buf.readUInt16BE(offset + 6)),
     authorities: new Array(buf.readUInt16BE(offset + 8)),
diff --git a/package.json b/package.json
index 736ba25..a0acdc4 100644
--- a/package.json
+++ b/package.json
@@ -32,7 +32,8 @@
   ],
   "files": [
     "index.js",
-    "types.js"
+    "types.js",
+    "rcodes.js"
   ],
   "author": "Mathias Buus",
   "license": "MIT"
diff --git a/rcodes.js b/rcodes.js
new file mode 100644
index 0000000..4ca9db6
--- /dev/null
+++ b/rcodes.js
@@ -0,0 +1,48 @@
+/*
+ * Traditional DNS header RCODEs (4-bits) defined by IANA in
+ * https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml
+ */
+
+exports.toString = function (rcode) {
+  switch (rcode) {
+    case 0: return 'NOERROR'
+    case 1: return 'FORMERR'
+    case 2: return 'SERVFAIL'
+    case 3: return 'NXDOMAIN'
+    case 4: return 'NOTIMP'
+    case 5: return 'REFUSED'
+    case 6: return 'YXDOMAIN'
+    case 7: return 'YXRRSET'
+    case 8: return 'NXRRSET'
+    case 9: return 'NOTAUTH'
+    case 10: return 'NOTZONE'
+    case 11: return 'RCODE_11'
+    case 12: return 'RCODE_12'
+    case 13: return 'RCODE_13'
+    case 14: return 'RCODE_14'
+    case 15: return 'RCODE_15'
+  }
+  return 'RCODE_' + type
+}
+
+exports.toRcode = function (code) {
+  switch (code.toUpperCase()) {
+    case 'NOERROR': return 0
+    case 'FORMERR': return 1
+    case 'SERVFAIL': return 2
+    case 'NXDOMAIN': return 3
+    case 'NOTIMP': return 4
+    case 'REFUSED': return 5
+    case 'YXDOMAIN': return 6
+    case 'YXRRSET': return 7
+    case 'NXRRSET': return 8
+    case 'NOTAUTH': return 9
+    case 'NOTZONE': return 10
+    case 'RCODE_11': return 11
+    case 'RCODE_12': return 12
+    case 'RCODE_13': return 13
+    case 'RCODE_14': return 14
+    case 'RCODE_15': return 15
+  }
+  return 0
+}
\ No newline at end of file