About this tool
Check whether TCP ports are open on any host — HTTP (80), HTTPS (443), SSH (22) and custom ports, free in the browser.
It covers common ports such as HTTP (80), HTTPS (443), SSH (22) and FTP (21), and also lets you enter custom ports.
It is ideal for checking whether a service is available, diagnosing firewall blocks and validating server configuration.
Common TCP ports
An open port means a service is listening and accepting connections. Filtered or closed may be firewall, NAT or a stopped service.
| Term | Meaning |
|---|---|
| 80 / 443 | HTTP and HTTPS — web. |
| 22 | SSH — remote administration. |
| 25 / 587 | SMTP — outbound email. |
| 3306 / 5432 | MySQL / PostgreSQL — databases. |
| Filtered | Firewall blocks probe — different from closed (no service). |
How to use
- Enter the host or IP address you want to test.
- Pick a common port from the list or type a custom port.
- Click check to test the port's connectivity.
- See whether the port is open (reachable) or closed, with the response latency.
Use cases
- Check whether a web, email or database server is reachable.
- Diagnose firewall blocks on a specific port.
- Confirm a service started correctly after configuration.
- Test port availability for games, VPNs or self-hosted servers.
Frequently asked questions
What does an open port mean?
An open port means a service is listening on it and accepting connections. A closed or filtered port does not respond, usually because no service is running or a firewall is blocking it.
Which ports can I check?
You can test any port from 1 to 65535. The tool also provides a list of the most common ports, such as 80 (HTTP), 443 (HTTPS), 22 (SSH) and 3306 (MySQL).
Why does a port show as closed when the service is running?
This usually happens because of firewall rules, NAT or routing that block external access, even when the service is active internally.
Does the Port Checker test TCP or UDP ports?
The check focuses on TCP ports, the protocol used by most services such as web, email and databases.
Is the Port Checker free?
Yes. The XploreNetHub Online Port Checker is free and runs directly in your browser.
How do I run a port test on a server?
Enter the host or IP, pick a port (80, 443, 22 or custom) and click check. The result shows whether the port is open, closed or filtered — ideal for a port test after deploy or firewall changes.