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Diablo II
TCP/UDP port 4000 is primarily known for facilitating the multiplayer connections of the classic Blizzard game Diablo II. The port allows players to connect to Battle.net servers or direct peer-to-peer sessions, enabling matchmaking, in-game communication, and other gameplay features..
Port 4000 is widely recognized for its association with Blizzard Entertainment's action role-playing game Diablo II. When players initiate multiplayer sessions, either through LAN or via the Battle.net platform, the game communicates using this port. The protocol involves both TCP and UDP traffic to support various game functions—in particular, TCP manages reliable data transfer such as user authentication and game state synchronization, while UDP facilitates fast, low-latency updates critical for responsive gameplay.
Technically, the port handles a custom Blizzard-designed application protocol. This protocol enables session management, player authentication, real-time messaging, and the coordination of game state across multiple participants. Because the protocol is proprietary, detailed packet structure is not publicly documented, but network analysis shows bidirectional exchange of game-critical information throughout the session lifespan.
Besides Diablo II, port 4000 may also be employed by fan-made private servers, community tools, and mods, all adhering broadly to Blizzard's communication style. Occasionally, the port is reused in unrelated gaming setups, but its identity is predominantly tied to Diablo II's multiplayer environment.