Check if a specific port is open on any host. Tests TCP connectivity with timeout detection. Useful for debugging firewalls, servers, and network configurations.
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An open port checker tests whether a specific TCP port is reachable on a remote host. When a port is open, a service is listening and accepting connections. When it is closed, no service is listening. When it is filtered, a firewall is blocking the connection. This tool sends a check request to our backend API which attempts a TCP connection to the specified host and port, returning the result with latency information.
Type the domain name (example.com) or IP address (192.168.1.1) of the server you want to check. Do not include the protocol (http://).
Enter the port number (1-65535) or click one of the common port presets: 80 (HTTP), 443 (HTTPS), 22 (SSH), 3306 (MySQL), etc.
The tool sends a TCP connection test to the specified host and port. Results appear within a few seconds, including latency if the port is reachable.
Open (green) means a service is listening. Closed (red) means no service is responding. If the check fails, command-line alternatives are shown for manual testing.
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