Open Port Checker

With this tool you can check if a port is open or not. Enter a hostname or an IP address and comma separated ports to check those ports status:

What is Port Checker?

The Open Port Checker is a free tool you can use to check your external IP address(not internal) and detect open ports on your connection. This tool is helpful for finding out if your port forwarding is setup correctly or if your server applications are being blocked by a firewall or something else. The Port Checker tool also can be used as a port scanner to scan your network for ports that are commonly forwarded. It is important to note that some ports, such as port 25, are often blocked at the ISP level in an attempt to prevent malicious activity.

How it Works?

Just paste your Host or IP and entered some of Ports to the inputs above and click to the button "Check" and you will be informed about whether the ports are open or not.

Attention: Timeout is set to 3 seconds per port. Maximum count of ports in the one request is 15.

Some of default ports

Port numbers ranges from 1 to 65535

• 0-1023 - Well known ports (HTTP, SMTP, DHCP, FTP etc)
• 1024-49151 - Reserved Ports
• 49152-65535 - Dynamic/Private Ports