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https://ndpsoftware.com/git-cheatsheet.html

NMAP (Network Mapper) is the de facto open source network scanner used by almost all security professionals to enumerate open ports and find live hosts in a network (and much more really).

Nmap is the most known port scanner, written and maintained by Gordon Lyon (Fyodor).
It can be used for network discovery and for most security enumeration during the initial stages of penetration testing.

Nmap has a multitude of options and when you first start playing with this tool it can be a bit daunting, so today i want to propose a brief cheat-sheet.