diff --git a/Source/MQTTnet/Server/MqttServer.cs b/Source/MQTTnet/Server/MqttServer.cs
index 4c5ab62..a76e658 100644
--- a/Source/MQTTnet/Server/MqttServer.cs
+++ b/Source/MQTTnet/Server/MqttServer.cs
@@ -190,6 +190,8 @@ namespace MQTTnet.Server
             return _retainedMessagesManager?.ClearMessagesAsync();
         }
 
+        public bool IsStarted => _cancellationTokenSource != null;
+
         private Task OnHandleClient(IMqttChannelAdapter channelAdapter)
         {
             return _clientSessionsManager.HandleClientAsync(channelAdapter);