UDP 27016
Synopsis
- Space Engineers Dedicated Server uses UDP 27016 as its default server port for gameplay and Steam queries.
- Unturned dedicated servers commonly use UDP 27016 as the Steam query port (with 27015 for game traffic).
- Many Valve/Steam-based dedicated servers (e.g., Counter-Strike: Global Offensive/CS2, Team Fortress 2, Garry’s Mod) use UDP 27016 as an alternate game or query port, especially for second instances.
- The Steam server query protocol (A2S) runs over UDP and is frequently exposed on 27016 for these titles to support server browser listings and status queries.
- This port/protocol has been abused for UDP reflection/amplification DDoS attacks leveraging the Steam A2S query mechanism on exposed game servers.
Observed activity
Last 30 days
Detailed chart