diff --git a/app/src/main/java/org/opencord/aaa/impl/RequestIdentifier.java b/app/src/main/java/org/opencord/aaa/impl/RequestIdentifier.java
new file mode 100644
index 0000000..9869af1
--- /dev/null
+++ b/app/src/main/java/org/opencord/aaa/impl/RequestIdentifier.java
@@ -0,0 +1,69 @@
+/*
+ * Copyright 2020-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.opencord.aaa.impl;
+
+import java.util.Objects;
+
+/**
+ * An identifier for an authentication request.
+ */
+public final class RequestIdentifier {
+
+    private byte identifier;
+
+    /**
+     * Creates a new request identifier.
+     *
+     * @param identifier id number
+     */
+    private RequestIdentifier(byte identifier) {
+        this.identifier = identifier;
+    }
+
+    /**
+     * Returns the id number.
+     *
+     * @return id
+     */
+    public byte identifier() {
+        return this.identifier;
+    }
+
+    /**
+     * Creates a new request identifier.
+     *
+     * @param identifier id number
+     * @return identifier
+     */
+    public static RequestIdentifier of(byte identifier) {
+        return new RequestIdentifier(identifier);
+    }
+
+    public boolean equals(Object other) {
+        if (!(other instanceof RequestIdentifier)) {
+            return false;
+        }
+
+        RequestIdentifier that = (RequestIdentifier) other;
+
+        return identifier == that.identifier;
+    }
+
+    public int hashCode() {
+        return Objects.hashCode(identifier);
+    }
+}