diff --git a/runtime/lib/developer.cc b/runtime/lib/developer.cc
index 5d6027b8f9f..e2f5a1ba12e 100644
--- a/runtime/lib/developer.cc
+++ b/runtime/lib/developer.cc
@@ -172,4 +172,16 @@ DEFINE_NATIVE_ENTRY(Developer_webServerControl, 2) {
 #endif
 }
 
+
+DEFINE_NATIVE_ENTRY(Developer_getIsolateIDFromSendPort, 1) {
+#if defined(PRODUCT)
+  return Object::null();
+#else
+  GET_NON_NULL_NATIVE_ARGUMENT(SendPort, port, arguments->NativeArgAt(0));
+  int64_t port_id = port.Id();
+  return String::NewFormatted(ISOLATE_SERVICE_ID_FORMAT_STRING, port_id);
+#endif
+}
+
+
 }  // namespace dart
diff --git a/runtime/lib/developer.dart b/runtime/lib/developer.dart
index e9b90b92ded..78c1d6d53b2 100644
--- a/runtime/lib/developer.dart
+++ b/runtime/lib/developer.dart
@@ -154,7 +154,10 @@ _postResponse(SendPort replyPort,
 
 @patch int _getServiceMinorVersion() native "Developer_getServiceMinorVersion";
 
-@patch void _getServerInfo(SendPort sp) native "Developer_getServerInfo";
+@patch void _getServerInfo(SendPort sendPort) native "Developer_getServerInfo";
 
-@patch void _webServerControl(SendPort sp, bool enable)
-    native "Developer_webServerControl";
\ No newline at end of file
+@patch void _webServerControl(SendPort sendPort, bool enable)
+    native "Developer_webServerControl";
+
+@patch String _getIsolateIDFromSendPort(SendPort sendPort)
+    native "Developer_getIsolateIDFromSendPort";
diff --git a/runtime/observatory/tests/service/developer_service_get_isolate_id_test.dart b/runtime/observatory/tests/service/developer_service_get_isolate_id_test.dart
new file mode 100644
index 00000000000..f3a24b07b5d
--- /dev/null
+++ b/runtime/observatory/tests/service/developer_service_get_isolate_id_test.dart
@@ -0,0 +1,90 @@
+// Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+// VMOptions=--error_on_bad_type --error_on_bad_override
+
+import 'dart:async';
+import 'dart:developer' as dev;
+import 'dart:isolate' as Core;
+
+import 'package:observatory/service_io.dart' as Service;
+import 'package:unittest/unittest.dart';
+import 'service_test_common.dart';
+import 'test_helper.dart';
+
+
+// testee state.
+String selfId;
+Core.Isolate childIsolate;
+String childId;
+
+void spawnEntry(int i) {
+  dev.debugger();
+}
+
+Future testeeMain() async {
+  dev.debugger();
+  // Spawn an isolate.
+  childIsolate = await Core.Isolate.spawn(spawnEntry, 0);
+  // Assign the id for this isolate and it's child to strings so they can
+  // be read by the tester.
+  selfId = dev.Service.getIsolateID(Core.Isolate.current);
+  childId = dev.Service.getIsolateID(childIsolate);
+  dev.debugger();
+}
+
+// tester state:
+Service.Isolate initialIsolate;
+Service.Isolate localChildIsolate;
+
+var tests = [
+  (Service.VM vm) async {
+    // Sanity check.
+    expect(vm.isolates.length, 1);
+    initialIsolate = vm.isolates[0];
+    await hasStoppedAtBreakpoint(initialIsolate);
+    // Resume.
+    await initialIsolate.resume();
+  },
+  (Service.VM vm) async {
+    // Initial isolate has paused at second debugger call.
+    await hasStoppedAtBreakpoint(initialIsolate);
+  },
+  (Service.VM vm) async {
+    // Reload the VM.
+    await vm.reload();
+
+    // Grab the child isolate.
+    localChildIsolate =
+        vm.isolates.firstWhere(
+            (Service.Isolate i) => i != initialIsolate);
+    expect(localChildIsolate, isNotNull);
+
+    // Reload the initial isolate.
+    await initialIsolate.reload();
+
+    // Grab the root library.
+    Service.Library rootLbirary = await initialIsolate.rootLibrary.load();
+
+    // Grab self id.
+    Service.Instance localSelfId =
+        await initialIsolate.eval(rootLbirary, 'selfId');
+
+    // Check that the id reported from dart:developer matches the id reported
+    // from the service protocol.
+    expect(localSelfId.isString, true);
+    expect(initialIsolate.id, equals(localSelfId.valueAsString));
+
+    // Grab the child isolate's id.
+    Service.Instance localChildId =
+        await initialIsolate.eval(rootLbirary, 'childId');
+
+    // Check that the id reported from dart:developer matches the id reported
+    // from the service protocol.
+    expect(localChildId.isString, true);
+    expect(localChildIsolate.id, equals(localChildId.valueAsString));
+  }
+];
+
+main(args) async => runVMTests(args, tests,
+    testeeConcurrent: testeeMain);
diff --git a/runtime/observatory/tests/service/service_test_common.dart b/runtime/observatory/tests/service/service_test_common.dart
index 2a68a528c6b..bf1d013c5d8 100644
--- a/runtime/observatory/tests/service/service_test_common.dart
+++ b/runtime/observatory/tests/service/service_test_common.dart
@@ -157,7 +157,7 @@ Future<Isolate> hasPausedFor(Isolate isolate, String kind) {
   isolate.vm.getEventStream(VM.kDebugStream).then((stream) {
     var subscription;
     subscription = stream.listen((ServiceEvent event) {
-        if (event.kind == kind) {
+        if ((isolate == event.isolate) && (event.kind == kind)) {
           if (completer != null) {
             // Reload to update isolate.pauseEvent.
             print('Paused with $kind');
diff --git a/runtime/vm/bootstrap_natives.h b/runtime/vm/bootstrap_natives.h
index 536299c65f9..20861868410 100644
--- a/runtime/vm/bootstrap_natives.h
+++ b/runtime/vm/bootstrap_natives.h
@@ -71,6 +71,7 @@ namespace dart {
   V(Bigint_getDigits, 1)                                                       \
   V(Bigint_allocate, 4)                                                        \
   V(Developer_debugger, 2)                                                     \
+  V(Developer_getIsolateIDFromSendPort, 1)                                     \
   V(Developer_getServerInfo, 1)                                                \
   V(Developer_getServiceMajorVersion, 0)                                       \
   V(Developer_getServiceMinorVersion, 0)                                       \
diff --git a/runtime/vm/isolate.cc b/runtime/vm/isolate.cc
index e4cbfaf89dc..aa851bfed42 100644
--- a/runtime/vm/isolate.cc
+++ b/runtime/vm/isolate.cc
@@ -1974,7 +1974,7 @@ void Isolate::PrintJSON(JSONStream* stream, bool ref) {
   }
   JSONObject jsobj(stream);
   jsobj.AddProperty("type", (ref ? "@Isolate" : "Isolate"));
-  jsobj.AddFixedServiceId("isolates/%" Pd64 "",
+  jsobj.AddFixedServiceId(ISOLATE_SERVICE_ID_FORMAT_STRING,
                           static_cast<int64_t>(main_port()));
 
   jsobj.AddProperty("name", debugger_name());
diff --git a/runtime/vm/service.h b/runtime/vm/service.h
index 8ee0c007077..a1ee159c3e4 100644
--- a/runtime/vm/service.h
+++ b/runtime/vm/service.h
@@ -41,6 +41,7 @@ class ServiceIdZone {
  private:
 };
 
+#define ISOLATE_SERVICE_ID_FORMAT_STRING "isolates/%" Pd64 ""
 
 class RingServiceIdZone : public ServiceIdZone {
  public:
diff --git a/sdk/lib/_internal/js_runtime/lib/developer_patch.dart b/sdk/lib/_internal/js_runtime/lib/developer_patch.dart
index b9e35b2773f..541658b1289 100644
--- a/sdk/lib/_internal/js_runtime/lib/developer_patch.dart
+++ b/sdk/lib/_internal/js_runtime/lib/developer_patch.dart
@@ -117,11 +117,16 @@ int _getServiceMinorVersion() {
 }
 
 @patch
-void _getServerInfo(SendPort sp) {
-  sp.send(null);
+void _getServerInfo(SendPort sendPort) {
+  sendPort.send(null);
 }
 
 @patch
-void _webServerControl(SendPort sp, bool enable) {
-  sp.send(null);
+void _webServerControl(SendPort sendPort, bool enable) {
+  sendPort.send(null);
 }
+
+@patch
+String _getIsolateIDFromSendPort(SendPort sendPort) {
+  return null;
+}
\ No newline at end of file
diff --git a/sdk/lib/developer/developer.dart b/sdk/lib/developer/developer.dart
index 47ea5babfcf..aab137c3b49 100644
--- a/sdk/lib/developer/developer.dart
+++ b/sdk/lib/developer/developer.dart
@@ -17,7 +17,7 @@ library dart.developer;
 
 import 'dart:async';
 import 'dart:convert';
-import 'dart:isolate' show RawReceivePort, SendPort;
+import 'dart:isolate' show Isolate, RawReceivePort, SendPort;
 
 part 'extension.dart';
 part 'profiler.dart';
diff --git a/sdk/lib/developer/service.dart b/sdk/lib/developer/service.dart
index 9ccf0dccc26..bbe954def25 100644
--- a/sdk/lib/developer/service.dart
+++ b/sdk/lib/developer/service.dart
@@ -73,13 +73,26 @@ class Service {
     receivePort.close();
     return new ServiceProtocolInfo(uri);
   }
+
+  /// Returns a [String] token representing the ID of [isolate].
+  ///
+  /// Returns null if the running Dart environment does not support the service
+  /// protocol.
+  static String getIsolateID(Isolate isolate) {
+    if (isolate is! Isolate) {
+      throw new ArgumentError.value(isolate,
+                                    'isolate',
+                                    'Must be an Isolate');
+    }
+    return _getIsolateIDFromSendPort(isolate.controlPort);
+  }
 }
 
-/// [sp] will receive a Uri or null.
-external void _getServerInfo(SendPort sp);
+/// [sendPort] will receive a Uri or null.
+external void _getServerInfo(SendPort sendPort);
 
-/// [sp] will receive a Uri or null.
-external void _webServerControl(SendPort sp, bool enable);
+/// [sendPort] will receive a Uri or null.
+external void _webServerControl(SendPort sendPort, bool enable);
 
 /// Returns the major version of the service protocol.
 external int _getServiceMajorVersion();
@@ -87,3 +100,5 @@ external int _getServiceMajorVersion();
 /// Returns the minor version of the service protocol.
 external int _getServiceMinorVersion();
 
+/// Returns the service id for the isolate that owns [sendPort].
+external String _getIsolateIDFromSendPort(SendPort sendPort);
\ No newline at end of file