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OpenTTD
OpenTTD is a popular open-source simulation game that emulates and expands upon the classic Transport Tycoon Deluxe. It uses this port primarily to facilitate multiplayer connections, enabling players to collaboratively or competitively build transportation networks over the internet or local networks..
OpenTTD extends Transport Tycoon Deluxe with features such as larger maps, dedicated servers, and multiplayer support. The game relies on port 3979 for both game server hosting and client connections. This port facilitates real-time data exchange, including player actions, updates to the game world, and messaging.
Communication over port 3979 includes server discovery, version negotiation, authentication, and game state synchronization. Both TCP and UDP are utilized: TCP handles reliable data transactions such as game commands, while UDP is used for latency-sensitive information like positional updates, optimizing gameplay smoothness.
Deployment can be on dedicated or player-hosted servers, with NAT traversal relying on port forwarding to ensure external client connections. The port is unofficial and configurable, so server hosts may adjust it to avoid conflicts or for security purposes.