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High Quality Content by WIKIPEDIA articles! A port scanner is a software application designed to probe a network host for open ports. This is often used by administrators to verify security policies of their networks and by attackers to identify running services on a host with the view to compromising it. To portscan a host is to scan for listening ports on a single target host. To portsweep is to scan multiple hosts for a specific listening port. The latter is typically used in searching for a specific service, for example, an SQL-based computer worm may portsweep looking for hosts listening on TCP/UDP port 1433.