diff --git a/lib/guid.dart b/lib/guid.dart
new file mode 100644
index 0000000..51e2720
--- /dev/null
+++ b/lib/guid.dart
@@ -0,0 +1,108 @@
+class Guid {
+  final List<int> bytes;
+
+  Guid.empty() : bytes = List.filled(16, 0);
+
+  Guid.fromBytes(this.bytes)
+    : assert(_checkLen(bytes.length), 'GUID must be 16, 32, or 128 bit.');
+
+  Guid.fromString(String input) : bytes = _fromString(input);
+
+  Guid(String input) : bytes = _fromString(input);
+
+  static List<int> _fromString(String input) {
+    if (input.isEmpty) {
+      return List.filled(16, 0);
+    }
+
+    input = input.replaceAll('-', '');
+
+    List<int>? bytes = _tryHexDecode(input);
+    if (bytes == null) {
+      throw FormatException("GUID not hex format: $input");
+    }
+
+    _checkLen(bytes.length);
+
+    return bytes;
+  }
+
+  static bool _checkLen(int len) {
+    if (!(len == 16 || len == 4 || len == 2)) {
+      throw FormatException(
+        "GUID must be 16, 32, or 128 bit, yours: ${len * 8}-bit",
+      );
+    }
+    return true;
+  }
+
+  static List<int>? _tryHexDecode(String hex) {
+    List<int> numbers = [];
+    for (int i = 0; i < hex.length; i += 2) {
+      String hexPart = hex.substring(i, i + 2);
+      int? num = int.tryParse(hexPart, radix: 16);
+      if (num == null) {
+        return null;
+      }
+      numbers.add(num);
+    }
+    return numbers;
+  }
+
+  // 128-bit representation
+  String get str128 {
+    if (bytes.length == 2) {
+      // 16-bit uuid
+      return '0000${_hexEncode(bytes)}-0000-1000-8000-00805f9b34fb'
+          .toLowerCase();
+    }
+    if (bytes.length == 4) {
+      // 32-bit uuid
+      return '${_hexEncode(bytes)}-0000-1000-8000-00805f9b34fb'.toLowerCase();
+    }
+    // 128-bit uuid
+    String one = _hexEncode(bytes.sublist(0, 4));
+    String two = _hexEncode(bytes.sublist(4, 6));
+    String three = _hexEncode(bytes.sublist(6, 8));
+    String four = _hexEncode(bytes.sublist(8, 10));
+    String five = _hexEncode(bytes.sublist(10, 16));
+    return "$one-$two-$three-$four-$five".toLowerCase();
+  }
+
+  // shortest representation
+  String get str {
+    bool starts = str128.startsWith('0000');
+    bool ends = str128.contains('-0000-1000-8000-00805f9b34fb');
+    if (starts && ends) {
+      // 16-bit
+      return str128.substring(4, 8);
+    }
+    if (ends) {
+      // 32-bit
+      return str128.substring(0, 8);
+    }
+    // 128-bit
+    return str128;
+  }
+
+  @override
+  String toString() => str;
+
+  @override
+  operator ==(other) => other is Guid && hashCode == other.hashCode;
+
+  @override
+  int get hashCode => str128.hashCode;
+
+  @Deprecated('use str128 instead')
+  String get uuid128 => str128;
+
+  @Deprecated('use str instead')
+  String get uuid => str;
+
+  String _hexEncode(List<int> numbers) {
+    return numbers
+        .map((n) => (n & 0xFF).toRadixString(16).padLeft(2, '0'))
+        .join();
+  }
+}
diff --git a/lib/method_channel_midi_command.dart b/lib/method_channel_midi_command.dart
index 8dddaf8..6f75837 100644
--- a/lib/method_channel_midi_command.dart
+++ b/lib/method_channel_midi_command.dart
@@ -27,6 +27,11 @@ class MethodChannelMidiCommand extends MidiCommandPlatform {
           map["type"], map["connected"] == "true");
       dev.inputPorts = _portsFromDevice(map["inputs"], MidiPortType.IN);
       dev.outputPorts = _portsFromDevice(map["outputs"], MidiPortType.OUT);
+      dev.serviceUUIDs = (map["serviceUUIDs"] is List)
+          ? (map["serviceUUIDs"] as List)
+              .map((e) => Guid(e.toString()))
+              .toList()
+          : [];
       return dev;
     }).toList();
   }
diff --git a/lib/midi_device.dart b/lib/midi_device.dart
index 62bd5fe..cd4215c 100644
--- a/lib/midi_device.dart
+++ b/lib/midi_device.dart
@@ -1,4 +1,7 @@
 import 'package:flutter_midi_command_platform_interface/midi_port.dart';
+import 'package:flutter_midi_command_platform_interface/guid.dart';
+
+export 'guid.dart';
 
 class MidiDevice {
   String name;
@@ -7,6 +10,7 @@ class MidiDevice {
   List<MidiPort> inputPorts = [];
   List<MidiPort> outputPorts = [];
   bool connected;
+  List<Guid> serviceUUIDs = [];
 
   MidiDevice(this.id, this.name, this.type, this.connected);