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Required Ports for Steam

Which ports do I need to open on my router or firewall for Steam?

To log into Steam and download content:
  • HTTP (TCP port 80) and HTTPS (443)
  • UDP 27015 through 27030
  • TCP 27015 through 27030
Steam Client
  • UDP 27000 to 27015 inclusive (Game client traffic)
  • UDP 27015 to 27030 inclusive (Typically Matchmaking and HLTV)
  • UDP 27031 and 27036 (incoming, for In-Home Streaming)
  • TCP 27036 and 27037 (incoming, for In-Home Streaming)
  • UDP 4380
Dedicated or Listen Servers
  • TCP 27015 (SRCDS Rcon port)
Steamworks P2P Networking and Steam Voice Chat
  • UDP 3478 (Outbound)
  • UDP 4379 (Outbound)
  • UDP 4380 (Outbound)


Many university networks and proxies block required ports for Steam operation - please consult your network administrator to ensure the required ports are open if you are using a university network or a proxy. Ports required for Steam can not be re-mapped to HTTP or reconfigured to a custom port range.


For generic Steam HTTP/HTTPS requests, your proxy should allow the following domains:


Most of the non-web traffic is usually UDP but can be TCP as well. For that, the IPs will all be from the Valve network (AS32590), and a list of those IP blocks can be found here:

Problem with Steam?

Contact Steam Support
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