Scan and detect open ports on a server or host.
Try: google.com, github.com, cloudflare.com
Port Scanner checks which ports are open and accessible on a server. Useful for network security audits, troubleshooting connectivity issues, and identifying services running on a host.
A port is an endpoint for network communication. Each port handles different services (80=HTTP, 443=HTTPS, 22=SSH, etc).
Ports are closed by default for security. They're only open if a service is running and firewall allows access.
Port scanning your own servers is legal. Scanning others' servers without permission may violate laws.
HTTP (80), HTTPS (443), SSH (22), FTP (21), MySQL (3306), and PostgreSQL (5432) are most common.