Free Port Checker — Test Open Ports Online
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About This Tool
The Port Checker tests whether a specific TCP port is open and accepting connections on a given host. Useful for verifying firewall rules, confirming service availability, debugging connection issues, and checking which ports are exposed. Enter a host and port number to test instantly. Free, no account needed.
How to Use
- 1
Enter the hostname or IP address you want to test.
- 2
Enter the port number you want to check (e.g., 80, 443, 22).
- 3
The result shows whether the port is open, closed, or filtered.
Frequently Asked Questions
What does it mean when a port is "filtered"?
A filtered port does not respond at all — usually because a firewall is silently dropping requests. A closed port responds with a rejection.
What ports are commonly tested?
80 (HTTP), 443 (HTTPS), 22 (SSH), 21 (FTP), 25 (SMTP), 3306 (MySQL), 5432 (PostgreSQL) are the most commonly tested ports.
Is this port checker free?
Yes. Completely free with no account required.