diff --git a/incubator/protobuf/services/nb/src/main/java/org/onosproject/incubator/protobuf/services/nb/GrpcNbMastershipService.java b/incubator/protobuf/services/nb/src/main/java/org/onosproject/incubator/protobuf/services/nb/GrpcNbMastershipService.java
new file mode 100644
index 0000000..1495467
--- /dev/null
+++ b/incubator/protobuf/services/nb/src/main/java/org/onosproject/incubator/protobuf/services/nb/GrpcNbMastershipService.java
@@ -0,0 +1,167 @@
+/*
+ * Copyright 2017-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.onosproject.incubator.protobuf.services.nb;
+
+
+import com.google.common.annotations.Beta;
+import io.grpc.BindableService;
+import io.grpc.stub.StreamObserver;
+import org.apache.felix.scr.annotations.Activate;
+import org.apache.felix.scr.annotations.Component;
+import org.apache.felix.scr.annotations.Deactivate;
+import org.apache.felix.scr.annotations.Reference;
+import org.apache.felix.scr.annotations.ReferenceCardinality;
+import org.onosproject.cluster.NodeId;
+import org.onosproject.cluster.RoleInfo;
+import org.onosproject.grpc.nb.mastership.MastershipServiceGrpc;
+import org.onosproject.grpc.nb.mastership.MastershipServiceNb;
+import org.onosproject.grpc.nb.mastership.MastershipServiceNb.getLocalRoleReply;
+import org.onosproject.grpc.nb.mastership.MastershipServiceNb.getLocalRoleRequest;
+import org.onosproject.grpc.nb.mastership.MastershipServiceNb.isLocalMasterReply;
+import org.onosproject.grpc.nb.mastership.MastershipServiceNb.isLocalMasterRequest;
+import org.onosproject.grpc.nb.mastership.MastershipServiceNb.relinquishMastershipSyncReply;
+import org.onosproject.grpc.nb.mastership.MastershipServiceNb.relinquishMastershipSyncRequest;
+import org.onosproject.grpc.nb.mastership.MastershipServiceNb.requestRoleForSyncReply;
+import org.onosproject.grpc.nb.mastership.MastershipServiceNb.requestRoleForSyncRequest;
+import org.onosproject.incubator.protobuf.models.cluster.NodeIdProtoTranslator;
+import org.onosproject.incubator.protobuf.models.cluster.RoleInfoProtoTranslator;
+import org.onosproject.incubator.protobuf.models.net.MastershipRoleProtoTranslator;
+import org.onosproject.mastership.MastershipService;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.MastershipRole;
+import org.onosproject.protobuf.api.GrpcServiceRegistry;
+import org.slf4j.Logger;
+
+import static org.slf4j.LoggerFactory.getLogger;
+
+/**
+ * A server that provides access to the methods exposed by {@link MastershipService}.
+ */
+
+@Beta
+@Component(immediate = true)
+public class GrpcNbMastershipService {
+
+    private final Logger log = getLogger(getClass());
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected GrpcServiceRegistry registry;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected MastershipService mastershipService;
+
+    private static MastershipServiceNbServerInternal instance = null;
+
+    @Activate
+    public void activate() {
+        registry.register(getInnerInstance());
+        log.info("Started.");
+    }
+
+    @Deactivate
+    public void deactivate() {
+        registry.unregister(getInnerInstance());
+        log.info("Stopped");
+    }
+
+    /**
+     * Register Mastership Service, used for unit testing purposes.
+     *
+     * @return an instance of binding Mastership service
+     */
+    public InProcessServer<BindableService> registerInProcessServer() {
+        InProcessServer<BindableService> inprocessServer =
+                new InProcessServer(GrpcNbMastershipService.MastershipServiceNbServerInternal.class);
+        inprocessServer.addServiceToBind(getInnerInstance());
+
+        return inprocessServer;
+    }
+
+    private class MastershipServiceNbServerInternal extends MastershipServiceGrpc.MastershipServiceImplBase {
+
+        @Override
+        public void getLocalRole(getLocalRoleRequest request,
+                                 StreamObserver<getLocalRoleReply> responseObserver) {
+            MastershipRole mr = mastershipService.getLocalRole(DeviceId.deviceId(request.getDeviceId()));
+
+            responseObserver.onNext(getLocalRoleReply.newBuilder()
+                    .setMastershipRole(MastershipRoleProtoTranslator.translate(mr))
+                    .build());
+            responseObserver.onCompleted();
+        }
+
+        @Override
+        public void isLocalMaster(isLocalMasterRequest request,
+                                  StreamObserver<isLocalMasterReply> responseObserver) {
+            boolean isLocalMaster = mastershipService.isLocalMaster(DeviceId.deviceId(request.getDeviceId()));
+
+            responseObserver.onNext(isLocalMasterReply.newBuilder()
+                    .setIsLocalMaster(isLocalMaster)
+                    .build());
+            responseObserver.onCompleted();
+        }
+
+        @Override
+        public void requestRoleForSync(requestRoleForSyncRequest request,
+                                       StreamObserver<requestRoleForSyncReply> responseObserver) {
+            MastershipRole mr = mastershipService.requestRoleForSync(DeviceId.deviceId(request.getDeviceId()));
+
+            responseObserver.onNext(requestRoleForSyncReply.newBuilder()
+                    .setMastershipRole(MastershipRoleProtoTranslator.translate(mr))
+                    .build());
+            responseObserver.onCompleted();
+        }
+
+        @Override
+        public void relinquishMastershipSync(relinquishMastershipSyncRequest request,
+                                             StreamObserver<relinquishMastershipSyncReply> responseObserver) {
+            relinquishMastershipSyncReply.Builder replyBuilder = relinquishMastershipSyncReply.newBuilder();
+            mastershipService.relinquishMastershipSync(DeviceId.deviceId(request.getDeviceId()));
+
+            responseObserver.onNext(replyBuilder.build());
+            responseObserver.onCompleted();
+        }
+
+        @Override
+        public void getMasterFor(MastershipServiceNb.getMasterForRequest request,
+                                 StreamObserver<MastershipServiceNb.getMasterForReply> responseObserver) {
+            NodeId nodeId = mastershipService.getMasterFor(DeviceId.deviceId(request.getDeviceId()));
+
+            responseObserver.onNext(MastershipServiceNb.getMasterForReply.newBuilder()
+                    .setNodeId(NodeIdProtoTranslator.translate(nodeId))
+                    .build());
+            responseObserver.onCompleted();
+        }
+
+        @Override
+        public void getNodesFor(MastershipServiceNb.getNodesForRequest request,
+                                StreamObserver<MastershipServiceNb.getNodesForReply> responseObserver) {
+            RoleInfo roleInfo = mastershipService.getNodesFor(DeviceId.deviceId(request.getDeviceId()));
+
+            responseObserver.onNext(MastershipServiceNb.getNodesForReply.newBuilder()
+                    .setRoleInfo(RoleInfoProtoTranslator.translate(roleInfo))
+                    .build());
+            responseObserver.onCompleted();
+        }
+    }
+
+    private MastershipServiceNbServerInternal getInnerInstance() {
+        if (instance == null) {
+            instance = new MastershipServiceNbServerInternal();
+        }
+        return instance;
+    }
+}