A port scanner is a software application designed to probe a server or 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 compromise it.
A port scan or portscan can be defined as an attack that sends client requests to a range of server port addresses on a host, with the goal of finding an active port and exploiting a known vulnerability of that service, although the majority of uses of a port scan are not attacks and are simple probes to determine services available on a remote machine.
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 port 1433.
Read more about Port Scanner: TCP/IP Basic Knowledge, Port Scanning Assumptions, Port Filtering By ISPs, Ethics, Legal Implications
Famous quotes containing the word port:
“How happy is the sailors life,
From coast to coast to roam;
In every port he finds a wife,
In every land a home.”
—Isaac Bickerstaffe (c. 17351812)