Port Checker
Check if a specific TCP port is open on a server or a device.
How to use Port Checker
- Enter the hostname or IP address of the target server.
- Enter the port number you want to check (1-65535).
- Click 'Check Port' to see if the port is accessible.
About Port Scanning
Open Port
An open port accepts TCP connections. It usually indicates a service is listening on that port.
Closed/Filtered Port
A closed port rejects connections, while a filtered port drops packets (often due to a firewall).
Common Ports
80 (HTTP), 443 (HTTPS), 21 (FTP), 22 (SSH), 25 (SMTP), 3306 (MySQL).