diff --git a/src/code.rs b/src/code.rs
new file mode 100644
index 0000000..b46d7bd
--- /dev/null
+++ b/src/code.rs
@@ -0,0 +1,40 @@
+#[derive(Debug)]
+pub enum Code {
+    AccessRequest = 1,
+    AccessAccept = 2,
+    AccessReject = 3,
+    AccountingRequest = 4,
+    AccountingResponse = 5,
+    AccessChallenge = 11,
+    StatusServer = 12,
+    StatusClient = 13,
+    DisconnectRequest = 40,
+    DisconnectACK = 41,
+    DisconnectNAK = 42,
+    CoARequest = 43,
+    CoAACK = 44,
+    CoANAK = 45,
+    Reserved = 255,
+}
+
+impl Code {
+    pub fn string(&self) -> &'static str {
+        match self {
+            Code::AccessRequest => "Access-Request",
+            Code::AccessAccept => "Access-Accept",
+            Code::AccessReject => "Access-Reject",
+            Code::AccountingRequest => "Accounting-Request",
+            Code::AccountingResponse => "Accounting-Response",
+            Code::AccessChallenge => "Access-Challenge",
+            Code::StatusServer => "Status-Server",
+            Code::StatusClient => "Status-Client",
+            Code::DisconnectRequest => "Disconnect-Request",
+            Code::DisconnectACK => "Disconnect-ACK",
+            Code::DisconnectNAK => "Disconnect-NAK",
+            Code::CoARequest => "CoA-Request",
+            Code::CoAACK => "CoA-ACK",
+            Code::CoANAK => "CoA-NAK",
+            Code::Reserved => "Reserved",
+        }
+    }
+}
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..9de50d4
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1 @@
+pub mod code;