Registered · Cross-platform

27015 Source / GoldSrc engine

TCP No
UDP Unofficial
SCTP —
DCCP —

What it is

Valve Source/GoldSrc dedicated server (CS, TF2, etc.).

When / why

Game server hosting (UDP/27015).

Protocol status detail

TransportStatusMeaning
TCP No Not assigned, standardized, or widely used on this port.
UDP Unofficial Not assigned by IANA, but standardized, specified, or widely used on this port.
SCTP — Not applicable for this transport.
DCCP — Not applicable for this transport.
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Port range

Registered (1024–49151). Assigned by IANA on request; usable without elevated privileges on most systems.

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