Open Port Checker
Check whether TCP ports are open on your public IP or any server — useful for port forwarding, game servers, CCTV/DVR access and server setup.
Ports are tested from our server. Only public addresses can be checked; nothing is stored.
How to use the Open Port Checker
Pick the address
Your own IP is filled in — or type any domain/IP.
Choose ports
Pick common ports or enter your own.
See open or closed
Each port is tested from our server.
Why use our Open Port Checker?
Your IP auto-filled
Test port forwarding on your router instantly.
Common ports
HTTP, HTTPS, SSH, FTP, SMTP, MySQL, RDP, Minecraft and more.
Multiple ports
Check up to 10 ports at once.
Response time
Connection time for open ports.
Clear explanations
Closed vs filtered, and how to fix port forwarding.
Safe
Only public addresses can be checked.
Frequently asked questions
Everything you need to know about the Open Port Checker.
Back to the toolWhat does an open port mean?
A service is listening on that port and accepting connections from the internet — for example a web server on 80/443 or a game server.
Why is my port closed after port forwarding?
Check that the device has a fixed local IP, the forwarding rule uses the right IP and port, the app is running, and Windows/antivirus firewall allows it. Many ISPs also use CGNAT, which blocks incoming connections — ask your ISP for a public IP.
What is the difference between closed and filtered?
“Closed” means the server answered but nothing is listening. “Timed out” usually means a firewall silently dropped the connection.
Is it legal to check ports?
Checking your own devices and servers is fine. Only scan systems you own or have permission to test.
Why can some ports not be checked?
Some hosting providers block outgoing connections on certain ports (for example 25 for email), so those ports may always show as closed from our server.
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