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Game Server Port Checker

Test whether your game server's port is open and reachable from the public internet. Enter your server's public IP or domain and a port - we attempt a TCP connection from outside your network and tell you if players can reach it. Works for Minecraft, ARK, Rust, Valheim, Palworld and any TCP port. No account, no install.

Quick fill:

How to read the result

  • Open - the TCP connection succeeded. Players on the internet can reach this port.
  • Closed - the host answered but nothing is listening. The server process is probably not running, or it is bound to the wrong port.
  • Filtered - no response at all. Usually the port is not forwarded in your router, a firewall is dropping it, or the server binds to 127.0.0.1 instead of 0.0.0.0. This is the most common "my friends can't join" cause.

TCP and UDP (Steam query)

TCP mode tests raw port reachability - use it for Minecraft, RCON, web panels, and any TCP service. UDP query (A2S) mode speaks the Steam Source query protocol: enter your query port (often the game port or game port + 1) and, if the server answers, you get its live status - name, map, and player count. ARK, Valheim, Rust, Palworld, CS2 and most Source-based games support A2S. Generic UDP open/closed for non-A2S games can't be confirmed from a single probe, so UDP mode reports a response rather than a blanket open/closed. For safety both modes only reach public, internet-routable addresses; private and loopback IPs are refused.

Related tools

Setting up a server? Build its config with our Minecraft RAM calculator, ARK settings generator, or Palworld settings generator.

Skip port forwarding entirely

Port forwarding, firewall rules, and dynamic IPs are the usual reasons a self-hosted server is unreachable. The tool is free and needs no account; if you would rather the ports just work, Supercraft hosts game servers with ports open out of the box - but the check above works against any host.

Frequently asked questions

How do I check if my game server port is open?

Enter your server's public IP address or domain and the port number, then run the check. Our server attempts a TCP connection from the public internet and reports whether the port is open, closed, or filtered. Open means players can reach it; filtered usually means a firewall is dropping packets or the port is not forwarded.

Why does my port show as filtered or closed?

Closed means the host is reachable but nothing is listening on that port - the server process is likely not running. Filtered means no response at all, which usually means the port is not forwarded in your router, a firewall is blocking it, or the server is bound to 127.0.0.1 instead of 0.0.0.0.

Does this check UDP ports?

Yes, via the Steam query (A2S) protocol. Switch the Check dropdown to UDP query and enter your server's query port. If the server speaks A2S - which ARK, Valheim, Rust, Palworld, CS2 and most Source-based games do - we show its live status: name, map, and player count. Plain UDP open/closed for non-A2S games cannot be determined reliably from one probe, so UDP mode confirms a response rather than a generic open/closed.

Can I check a private or local IP?

No. The checker only connects to public, internet-routable addresses. Private (192.168.x.x, 10.x.x.x), loopback (127.0.0.1), and link-local addresses are refused - those are only reachable from inside your own network, not from our server.

This tool: v1.8 · updated 3 Aug 2026