Port Checker
Check if ports are open or closed on any server.
Frequently Asked Questions
What ports should I check?
Common ports: 80 (HTTP), 443 (HTTPS), 22 (SSH), 21 (FTP), 3306 (MySQL), 5432 (PostgreSQL), 8080 (HTTP Alt), 3389 (RDP).
Why might a port appear closed?
A firewall may be blocking the port, the service may not be running, or the port may be filtered by the network.