![]() Ports 0 to 1023 are identified as the “well-known ports” or standard ports and have been assigned services by the Internet Assigned Numbers Authority (IANA). ![]() They are numbered from 0 to 65535, but certain ranges are more frequently used. Due to this functionality, it is also a popular reconnaissance tool for attackers seeking a weak point of access to break into a computer. It is also valuable for testing network security and the strength of the system’s firewall. This technique is known as fingerprinting. Running a port scan on a network or server reveals which ports are open and listening (receiving information) as well as revealing the presence of security devices, such as firewalls, that are present between the sender and the target. They can also be used by security analysts to confirm network security policies. Bad actors can use port scanners to exploit vulnerabilities by finding network services running on a host. ![]() A port scanner is an application which is made to probe a host or server to identify open ports.
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