Open Port
A network port that is actively listening for connections, potentially exposing a service to the internet.
What is Open Port?
What is Open Port?
When a port is open, it means a service is listening and accepting connections on that port number. Common open ports include 80 (HTTP), 443 (HTTPS), 22 (SSH), and 25 (SMTP). While some open ports are necessary (web servers need 80/443), others may indicate security risks — an open database port (3306, 5432) or remote desktop port (3389) exposed to the internet is a significant vulnerability. Regular port scanning helps organizations maintain awareness of their exposed services.
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