NMAP is the most port scanner that used in the world. It can be used to identiy live host, scan TCP and UDP open ports, detect firewalls, get version of services running in remote hosts, and even, with the use of scripts, find and exploit vurnerabilities.
NMAP is a port scanner that it sends packets to a number of TCP or UDP ports on the indicated IP Address and checks if there is a response or open or a service is running on that port.
https://nmap.org/nsedoc/scripts/
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