An open ports scanner is a diagnostic tool used to probe a server or host for open virtual communication gates. By identifying these open gates, administrators can find and secure potential Entry points. How Port Scanning Works
A scanner maps out a target network by sending specialized data packets to a range of ports (from 0 to 65,535) and analyzing the responses. The scanner classifies each port into one of three primary states:
Open: The device responds, indicating a service is actively listening for traffic.
Closed: The device responds with an error or reset packet, meaning no service is listening.
Filtered: The scanner receives no response, indicating a firewall is blocking the traffic. What is a Port Scan + How to Detect It – Vectra AI
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