Open Port Checker
Check which common service ports are reachable on your own public IP from the outside internet.
About the Open Port Checker tool
A port is a numbered door on your IP address that a specific service listens on - for example 80 and 443 for web traffic, 22 for SSH, and 25, 465 or 587 for mail. This tool tests common ports on your own public IP from the outside and reports each as open (something is listening and reachable) or closed/filtered (no response, usually a firewall or no service).
How to use it
- Click to run the check against your current public IP.
- Wait for each common port to be probed from our server.
- Read the open/closed result for each port in the list.
It is useful for confirming that a server, game host or remote-access service you set up is actually reachable, or for checking that a port you expect to be closed really is. Bear in mind that an "open" result means reachable from the internet at the moment of the test; a router restart, dynamic IP change or firewall rule can change that. To respect ownership, the tool only checks the IP your request comes from. That address is sent to our server purely to perform the check, and is not stored.
Frequently asked questions
Why can I only check my own IP and not any address?
Scanning ports on a server you do not control can be unwelcome or against acceptable-use rules. To keep things responsible, this tool only probes the public IP your own connection is using.
What is the difference between a closed and a filtered port?
A closed port responds that nothing is listening, while a filtered port gives no response at all, usually because a firewall is dropping the probe. Both mean the port is not usable from outside, and this tool reports them together as not open.
I opened a port on my router but it still shows closed. Why?
Common causes are a service not actually running on that port, your provider blocking it (often port 25 or carrier-grade NAT), or the forwarding rule pointing to the wrong internal device. Double-check each link in that chain.
Does an open port mean my network is unsafe?
Not by itself. An open port simply means a service is reachable. It becomes a risk only if that service is unpatched, badly configured or should not be exposed at all.