For example the most common transport protocols, like TCP and UDP use port numbers.Ī port number forms a tandem with the host’s IP address, and together they identify the connection, so that data is successfully routed from the sender to the recipient. Hence, this same technique is also used by cybercriminals for network reconnaissance and identification of potential targets.Ī port (or port number) is a numerical identifier of an endpoint or service taking part in a connection. It also tests for the presence and strength security measures, such as firewalls, that lie between the internal systems and the public internet. Network and security administrators use port scanning to discover potential vulnerabilities in their network-an open port represents a potential point of entry for an attacker. Port scanning is a networking technique that determines what ports on a network device are open and can receive or send data.
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