diff --git a/src/network/network_stun.h b/src/network/network_stun.h
new file mode 100644
--- /dev/null
+++ b/src/network/network_stun.h
@@ -0,0 +1,34 @@
+/*
+ * This file is part of OpenTTD.
+ * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
+ * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/** @file network_stun.h Part of the network protocol handling STUN requests. */
+
+#ifndef NETWORK_STUN_H
+#define NETWORK_STUN_H
+
+#include "core/tcp_stun.h"
+
+/** Class for handling the client side of the STUN connection. */
+class ClientNetworkStunSocketHandler : public NetworkStunSocketHandler {
+private:
+	std::string token;        ///< Token of this STUN handler.
+	uint8 family = AF_UNSPEC; ///< Family of this STUN handler.
+	bool sent_result = false; ///< Did we sent the result of the STUN connection?
+
+public:
+	TCPConnecter *connecter = nullptr; ///< Connecter instance.
+	NetworkAddress local_addr;         ///< Local addresses of the socket.
+
+	NetworkRecvStatus CloseConnection(bool error = true) override;
+	void SendReceive();
+
+	void Connect(const std::string &token, uint8 family);
+
+	static std::unique_ptr<ClientNetworkStunSocketHandler> Stun(const std::string &token, uint8 family);
+};
+
+#endif /* NETWORK_STUN_H */