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Nintendo Wi-Fi
Port 27900 was historically used by Nintendo Wi-Fi Connection, a service enabling online multiplayer gaming and content distribution for the Nintendo DS and Wii platforms. This port facilitated matchmaking services, friend management, and communication between consoles and Nintendo's backend infrastructure, before the service was discontinued in 2014..
Nintendo Wi-Fi Connection (WFC) utilized port 27900 predominantly for server-client communication related to multiplayer gaming. This port managed the initial handshake and matchmaking process, connecting Nintendo consoles with centralized infrastructure to find opponents and synchronize gameplay sessions.
Connectivity over port 27900 helped enable various gaming functionalities, including game state synchronization, ranking updates, and friends list management. Data transmitted was largely proprietary, focusing on efficient real-time information exchange tailored to the console hardware limitations at the time.
Despite the official shutdown of Nintendo's servers in 2014, homebrew projects and fan-hosted servers sometimes emulate this functionality, continuing to rely on the same port conventions to maintain compatibility with legacy devices.