Port Scanner
Check if specific network ports are open or closed on any server or domain name.
Run tool
Port Scanner checks network connectivity to specific TCP port numbers on any accessible server or domain name. Enter a target hostname or IP address, provide a comma-separated list of ports, and adjust the connection timeout between 0.5 and 30.0 seconds. The tool sends a connection probe to each listed port sequentially, recording whether each endpoint responds as open or closed. For common network ports such as 80, 443, or 22, the scanner automatically attaches recognizable service names like HTTP, HTTPS, or SSH directly in the output table. Ports outside the built-in reference list receive a general label. When the scan finishes, the result summary displays the tested hostname, total scanned ports, total open ports, and a detailed breakdown of individual port statuses. This utility helps network administrators, web developers, and server operators quickly verify firewall configurations and confirm whether remote services are actively listening.
Instructions
- Enter the target hostname or IP address into the Host field, or leave the default (example.com).
- Specify one or more port numbers separated by commas in the Ports field.
- Optionally set the connection timeout in seconds, between 0.5 and 30.0.
- Click the run button to initiate the connection checks for each listed port.
- Review the resulting table for open or closed statuses, detected service labels, and summary statistics.
Examples
- Check standard web ports: host 'example.com', ports '80, 443', timeout '3.0' to verify HTTP and HTTPS availability.
- Inspect remote administration and mail ports: host 'mail.example.org', ports '22, 25, 587, 993', timeout '5.0' to check listening services.
FAQ
What does an open port status indicate?
An open status means the tool established a network connection to that specific port on the destination server within the allocated timeout period.
Why might a port show as closed?
A port may report as closed if the remote service is not running, a firewall drops the connection packets, or the host fails to respond within the configured timeout.
Can I scan a custom list of port numbers?
Yes. Enter any comma-separated list of port integers in the Ports field, such as 8080, 8443, 3306.
What happens if a hostname cannot be resolved?
If DNS resolution fails for the entered hostname, the scan halts and an error message is displayed indicating the host could not be reached.