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Xfire
**Xfire** was an instant messaging client for gamers, combining gaming-oriented chat functionality with tools for in-game messaging, server browsing, and social features. This port (25999) was notably used by Xfire’s services to manage peer-to-peer communications, facilitate matchmaking, and enable real-time chatting while gaming..
Xfire utilized port 25999 to facilitate direct client-to-client and client-to-server communication for its gaming chat functions. The port supported messaging, game server queries, presence notifications, and rich media sharing such as game screenshots and stats uploads. It operated primarily over TCP connections for reliable communication during gameplay and chat synchronization.
Designed with integration in mind, Xfire could detect running games and interface directly to enable in-game overlays while maintaining connectivity on port 25999. This allowed seamless transitions between game and chat, as well as synchronization of gaming status updates, friend lists, and matchmaking information.
While the official Xfire service was discontinued, the port remains historically relevant. Custom or unofficial implementations, along with legacy game servers, may still utilize this port for communication. Because it is unofficial and was widely distributed, implementations may vary, lacking standardization.