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Network Tool

Portkontroll

Test whether any TCP port is open or closed on a host or IP address in real time.

Using the Port Checker

Port checking is a vital part of server administration and network security. This tool allows you to test if specific services (like web, mail, or FTP) are accessible from the outside world, helping you verify firewall rules and port forwarding.

How it Works

1
Enter the domain or IP address you want to test.
2
Input a custom "Port Number" or select a preset (e.g., 80 for HTTP, 443 for HTTPS).
3
Press Check to perform the TCP handshake.
4
Review the "Status" (Open, Closed, or Filtered/Timeout).

Frequently Asked Questions

What does it mean if a port is closed?

No application is listening on that port, or a firewall is blocking the connection.