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TinyMUD
Port 4201 is primarily associated with TinyMUD and its numerous derivatives, which are multiplayer text-based virtual environments. These Multi-User Dungeons enable players to create and explore interactive worlds solely through textual commands and storytelling. The port serves as the communication endpoint for client-to-server interactions in these MUD systems..
Port 4201 was historically utilized by TinyMUD servers, a class of early multiplayer online games originating in the late 1980s and early 1990s. TinyMUD and its derivatives use TCP as the primary transport protocol to enable real-time, text-based communication between connected players and the game server.
TinyMUD servers accept incoming client connections over port 4201. Players interact via direct telnet connections or specialized MUD client software, exchanging plain text commands and narrative responses. As the server operates in a stateless manner per request but maintains long-lived TCP sessions, it facilitates dynamic world-building and social interaction without graphical interfaces.
While there's no strict standardization, this port assignment has become a de facto default for TinyMUD servers. The game logic is highly configurable and extensible through server-side scripting, enabling diverse derivatives to extend the core TinyMUD functionality, all commonly using port 4201 for connectivity.