diff --git a/src/network/core/tcp_stun.h b/src/network/core/tcp_stun.h
new file mode 100644
--- /dev/null
+++ b/src/network/core/tcp_stun.h
@@ -0,0 +1,53 @@
+/*
+ * 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 tcp_stun.h Basic functions to receive and send TCP packets to/from the STUN server.
+ */
+
+#ifndef NETWORK_CORE_TCP_STUN_H
+#define NETWORK_CORE_TCP_STUN_H
+
+#include "os_abstraction.h"
+#include "tcp.h"
+#include "packet.h"
+
+/** Enum with all types of TCP STUN packets. The order MUST not be changed. **/
+enum PacketStunType {
+	PACKET_STUN_SERCLI_STUN,  ///< Send a STUN request to the STUN server.
+	PACKET_STUN_END,          ///< Must ALWAYS be on the end of this list!! (period)
+};
+
+/** Base socket handler for all STUN TCP sockets. */
+class NetworkStunSocketHandler : public NetworkTCPSocketHandler {
+protected:
+	bool ReceiveInvalidPacket(PacketStunType type);
+
+	/**
+	 * Send a STUN request to the STUN server letting the Game Coordinator know
+	 * what our actually public IP:port is.
+	 *
+	 *  uint8   Game Coordinator protocol version.
+	 *  string  Token to track the current STUN request.
+	 *  uint8   Which interface number this is (for example, IPv4 or IPv6).
+	 *          The Game Coordinator relays this number back in later packets.
+	 *
+	 * @param p The packet that was just received.
+	 * @return True upon success, otherwise false.
+	 */
+	virtual bool Receive_SERCLI_STUN(Packet *p);
+
+public:
+	/**
+	 * Create a new cs socket handler for a given cs.
+	 * @param s  the socket we are connected with.
+	 * @param address IP etc. of the client.
+	 */
+	NetworkStunSocketHandler(SOCKET s = INVALID_SOCKET) : NetworkTCPSocketHandler(s) {}
+};
+
+#endif /* NETWORK_CORE_TCP_STUN_H */