diff --git a/apps/openstacknetworking/src/main/java/org/onosproject/openstacknetworking/api/OpenstackNetworkEvent.java b/apps/openstacknetworking/src/main/java/org/onosproject/openstacknetworking/api/OpenstackNetworkEvent.java
new file mode 100644
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+++ b/apps/openstacknetworking/src/main/java/org/onosproject/openstacknetworking/api/OpenstackNetworkEvent.java
@@ -0,0 +1,151 @@
+/*
+ * Copyright 2017-present Open Networking Laboratory
+ *
+ * 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.onosproject.openstacknetworking.api;
+
+import org.joda.time.LocalDateTime;
+import org.onosproject.event.AbstractEvent;
+import org.openstack4j.model.network.Network;
+import org.openstack4j.model.network.Port;
+import org.openstack4j.model.network.Subnet;
+
+import static com.google.common.base.MoreObjects.toStringHelper;
+
+/**
+ * Describes OpenStack network service event.
+ */
+public class OpenstackNetworkEvent extends AbstractEvent<OpenstackNetworkEvent.Type, Network> {
+
+    private final Port port;
+    private final Subnet subnet;
+
+    public enum Type {
+        /**
+         * Signifies that a new OpenStack network is created.
+         */
+        OPENSTACK_NETWORK_CREATED,
+
+        /**
+         * Signifies that the OpenStack network is updated.
+         */
+        OPENSTACK_NETWORK_UPDATED,
+
+        /**
+         * Signifies that the OpenStack network is removed.
+         */
+        OPENSTACK_NETWORK_REMOVED,
+
+        /**
+         * Signifies that a new OpenStack subnet is created.
+         */
+        OPENSTACK_SUBNET_CREATED,
+
+        /**
+         * Signifies that the OpenStack subnet is updated.
+         */
+        OPENSTACK_SUBNET_UPDATED,
+
+        /**
+         * Signifies that the OpenStack subnet is removed.
+         */
+        OPENSTACK_SUBNET_REMOVED,
+
+        /**
+         * Signifies that a new OpenStack port is created.
+         */
+        OPENSTACK_PORT_CREATED,
+
+        /**
+         * Signifies that the OpenStack port is updated.
+         */
+        OPENSTACK_PORT_UPDATED,
+
+        /**
+         * Signifies that the OpenStack port is removed.
+         */
+        OPENSTACK_PORT_REMOVED
+    }
+
+    /**
+     * Creates an event of a given type for the specified network and the current time.
+     * @param type    openstack network event type
+     * @param network openstack network
+     */
+    public OpenstackNetworkEvent(Type type, Network network) {
+        super(type, network);
+        this.port = null;
+        this.subnet = null;
+    }
+
+    /**
+     * Creates an event of a given type for the specified network, port and the
+     * current time.
+     *
+     * @param type    openstack network event type
+     * @param network openstack network
+     * @param port    openstack port
+     */
+    public OpenstackNetworkEvent(Type type, Network network, Port port) {
+        super(type, network);
+        this.port = port;
+        this.subnet = null;
+    }
+
+    /**
+     * Creates an event of a given type for the specified network, subnet and the
+     * current time.
+     *
+     * @param type    openstack network event type
+     * @param network openstack network
+     * @param subnet  openstack subnet
+     */
+    public OpenstackNetworkEvent(Type type, Network network, Subnet subnet) {
+        super(type, network);
+        this.port = null;
+        this.subnet = subnet;
+    }
+
+    /**
+     * Returns the port of the network event.
+     *
+     * @return openstack port; null if the event is not port specific
+     */
+    public Port port() {
+        return port;
+    }
+
+    /**
+     * Returns the subnet of the network event.
+     *
+     * @return openstack subnet; null if the event is not subnet specific
+     */
+    public Subnet subnet() {
+        return subnet;
+    }
+
+    @Override
+    public String toString() {
+        if (port == null && subnet == null) {
+            return super.toString();
+        }
+        return toStringHelper(this)
+                .add("time", new LocalDateTime(time()))
+                .add("type", type())
+                .add("network", subject())
+                .add("port", port)
+                .add("subnet", subnet)
+                .toString();
+    }
+}