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Battle.net Gaming
Port 3723 is widely used by many Blizzard Entertainment games through their Battle.net service, including iconic titles such as Diablo II, Warcraft II, Warcraft III, and StarCraft. The port facilitates game server communication, matchmaking, lobby coordination, and real-time multiplayer data exchange, supporting both TCP and UDP traffic to ensure smooth gameplay across different network conditions..
Port 3723 serves as a key communication channel for Blizzard’s legacy Battle.net gaming platform. It enables various gameplay elements, including matchmaking, player authentication, chat functionalities, and in-game event synchronization. The port can handle both TCP and UDP protocols, which allows for flexible, reliable communication as well as fast transmission suited for real-time multiplayer gaming.
Typically, TCP is leveraged for reliable delivery of critical data such as login procedures, session management, and messaging, while UDP assists in low latency communication for gameplay data that requires speed over guaranteed arrival. This blend supports responsive game experiences without sacrificing essential connection stability. Because multiple classic Blizzard titles share this port, network administrators may observe concurrent or overlapping traffic types during active gameplay sessions.
Although port 3723 is considered an ‘unofficial’ port by IANA standards, it has become a standardized de facto listening port for Blizzard’s legacy games. Awareness of this can facilitate correct firewall rules and NAT configurations when supporting players or hosting custom servers reliant on older Blizzard software.