Free Open Port Checker Online — Check if a port is open on a host
Common ports:
21 (FTP)
22 (SSH)
25 (SMTP)
53 (DNS)
80 (HTTP)
443 (HTTPS)
3306 (MySQL)
5432 (PostgreSQL)
6379 (Redis)
8080 (Alt HTTP)
How to Check Open Ports
Enter a hostname and port number to test if that port is accessible. Click common port buttons for quick testing of standard services like HTTP (80), HTTPS (443), SSH (22).
What does an open port mean?
An open port means a service is listening and accepting connections on that port. Closed means no service is running, filtered means a firewall is blocking access.
Common port numbers
21=FTP, 22=SSH, 25=SMTP, 53=DNS, 80=HTTP, 443=HTTPS, 3306=MySQL, 5432=PostgreSQL, 6379=Redis, 8080=Alt HTTP.
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