B.net Index Server 3 is a legacy matchmaking and directory component within Blizzard Entertainment's Battle.net ecosystem. It served as a vital piece of infrastructure for classic titles like Warcraft III during the early 2000s. Core Functionality Game Discovery
B.net Index Server 3 (BIS3) is Blizzard Entertainment’s backend service for high-speed indexing, serving as a critical bridge between data storage (CASC) and clients by providing pre-computed maps of current game builds. It utilizes content-addressed storage and edge optimization to handle massive metadata scale, enabling rapid delta patching and reduced launch latency for games like World of Warcraft and Overwatch 2. For more details on the technical architecture of Blizzard's backend, you can explore public engineering blogs. B.net Index Server 3
Conclusion
POST /v3/games → Index Server creates Redis hash, adds to games_by_map sets.game_created to all clients who subscribed to topic:/games/new.