Enter a hostname or IP address and a port number to check if the port is open.
Error:
Port Check Result
for
How to Use the Open Port Checker
dns
1. Enter Hostname/IP
Type the hostname (e.g., google.com) or IP address (e.g., 8.8.8.8) to check.
settings_input_hdmi
2. Specify Port
Enter the TCP port number (e.g., 80 for HTTP, 443 for HTTPS, 22 for SSH).
network_check
3. Check Port Status
Click "Check Port". The tool will attempt to connect and display the status.
Frequently Asked Questions About Port Checking
What does "Open" mean?
expand_more
An "Open" status means that the port is accessible and actively listening for connections on the target host. This typically indicates that a service is running on that port.
What does "Closed" mean?
expand_more
"Closed" means that the port is accessible but no application is listening on it. The connection was refused by the host, indicating the port is not actively in use by a service.
What does "Filtered" mean?
expand_more
"Filtered" means that the port is being blocked by a firewall or other security mechanism. The tool couldn't establish a connection, and it didn't receive a response indicating if it's open or closed. This usually results in a timeout.
Why would I check a port?
expand_more
Port checking is useful for network troubleshooting, verifying firewall rules, diagnosing server issues, and ensuring that services you intend to be public are indeed accessible.