Whether you are deploying a web server, configuring a firewall, or troubleshooting connectivity, knowing which ports are open is essential. The Port Checker tests TCP connectivity to any port on any server, giving you instant confirmation of whether a port is accepting connections.
Enter a hostname or IP address and a port number to check. The tool attempts a TCP connection and reports whether the port is open, closed, or filtered by a firewall. You can test common service ports like 80 (HTTP), 443 (HTTPS), 22 (SSH), and 3306 (MySQL), or check any custom port up to 65535.
For comprehensive security audits, use the range scan feature to test multiple ports at once. Scan common port ranges or specify a custom range to discover all open ports on a server. The results show which services are likely running based on standard port assignments.