What Is Port Checker?
The Port Checker tests whether a specific TCP port on a host is open, closed, or filtered. It is essential for confirming that firewalls, NAT rules, and server applications are configured to accept traffic on the ports you need.
Who Uses the Port Checker?
System administrators and network engineers use it to verify SSH, HTTP, database, and game server ports are reachable from the internet.
How to Use the Port Checker
- Enter the hostname or IP address to test.
- Enter the port number you want to check.
- View whether the port is open, closed, or filtered along with response time.
Why Choose Our Port Checker?
- Tests any TCP port for open/closed/filtered status
- Useful for firewall and NAT rule verification
- Fast results with response time measurement
Try the Port Checker above — it is free, fast, and works on any device. Bookmark this page to return whenever you need it.