Send a request to a remote or local TCP or UDP port.Port scanners are among the top cybersecurity tools used by researchers, security teams, and ethical hackers to diagnose network issues, audit networks, run penetration testing, and perform vulnerability scanning tasks.Īll port scanners operate in a very basic way: Once the scan has finished, you can run other security penetration and exploit tests in order to verify how strong are the current security policies.Ī port scanner (also known as network scanner), is a software application used in cybersecurity and IT industries to scan networks, hosts, or IP addresses looking for open ports, closed ports, or filtered ports. Used by programmers, system and network administrators, these tools are applications designed to scan servers and hosts in order to check what available ports are being used for network communications. Before jumping into the top five most popular port scanners tools used in the infosec field, let's learn what is a port scanner and learn how port scanners work.

Port scanners are some of the most useful tools when you are starting your security investigation on any remote or local network.

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