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Valve Steam
Valve Steam Client uses port 1725 to facilitate communication for various gaming-related functions including server discovery, matchmaking, downloads, and updates. Primarily leveraging UDP, this port helps support low-latency, real-time data exchanges to ensure smooth gameplay and fast connectivity between Steam clients and game servers..
Port 1725 is primarily used by the Valve Steam Client, the digital distribution platform developed by Valve Corporation. Steam provides game purchasing, digital rights management (DRM), multiplayer gaming, and social networking services. The platform uses multiple network ports to manage tasks such as authentication, content delivery, matchmaking, and in-game communication.
While many interactions occur over TCP for reliability, Steam utilizes UDP port 1725 specifically for certain real-time features. UDP allows the Steam Client to perform quick connection setups, facilitate rapid data transfer without the overhead of connection management, and maintain low-latency communication necessary for features like server browsing, game updates, and peer-to-peer connectivity. The use of UDP also supports matchmaking processes and real-time updates with minimal delay, improving the user experience.
Because it's largely unofficial and is not formally registered with IANA, port 1725 is categorized as an unofficial Steam client port. Usage may vary based on the game and client version. It operates primarily on user devices and game servers that support Valve’s ecosystem, with flexible and dynamic behavior depending on network architecture and server requirements.