diff --git a/apps/openstacknetworking/src/main/java/org/onosproject/openstacknetworking/api/OpenstackNetworkService.java b/apps/openstacknetworking/src/main/java/org/onosproject/openstacknetworking/api/OpenstackNetworkService.java
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+++ b/apps/openstacknetworking/src/main/java/org/onosproject/openstacknetworking/api/OpenstackNetworkService.java
@@ -0,0 +1,97 @@
+/*
+ * 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.onosproject.event.ListenerService;
+import org.openstack4j.model.network.Network;
+import org.openstack4j.model.network.Port;
+import org.openstack4j.model.network.Subnet;
+
+import java.util.Set;
+
+/**
+ * Service for interacting with the inventory of OpenStack network and port.
+ */
+public interface OpenstackNetworkService
+        extends ListenerService<OpenstackNetworkEvent, OpenstackNetworkListener> {
+    /**
+     * Returns the network with the supplied network ID.
+     *
+     * @param networkId network id
+     * @return openstack network
+     */
+    Network network(String networkId);
+
+    /**
+     * Returns all networks registered in the service.
+     *
+     * @return set of networks
+     */
+    Set<Network> networks();
+
+    /**
+     * Returns the subnet with the supplied subnet ID.
+     *
+     * @param subnetId subnet id
+     * @return subnet
+     */
+    Subnet subnet(String subnetId);
+
+    /**
+     * Returns all subnets registered in the service.
+     *
+     * @return set of subnet
+     */
+    Set<Subnet> subnets();
+
+    /**
+     * Returns all subnets associated with the supplied network.
+     *
+     * @param networkId network id
+     * @return set of subnet
+     */
+    Set<Subnet> subnets(String networkId);
+
+    /**
+     * Returns the OpenStack port with the supplied port ID.
+     *
+     * @param portId openstack port id
+     * @return openstack port
+     */
+    Port port(String portId);
+
+    /**
+     * Returns the OpenStack port with the supplied ONOS port.
+     *
+     * @param port onos port
+     * @return openstack port
+     */
+    Port port(org.onosproject.net.Port port);
+
+    /**
+     * Returns all OpenStack ports registered in the service.
+     *
+     * @return set of ports
+     */
+    Set<Port> ports();
+
+    /**
+     * Returns all OpenStack ports associated with the supplied network.
+     * @param networkId network id
+     * @return set of ports
+     */
+    Set<Port> ports(String networkId);
+}