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$ sudo apt update && sudo apt upgrade
$ sudo apt install nmap
$ nmap --version

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$ nmap dixu.ddns.net
$ nmap 192.168.2.5

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$ nmap -p 8080 192.168.2.5
$ nmap -p 22,21,80 192.168.2.5
$ nmap -p 22,21,80 192.168.2.5-253

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$ nmap -sV 192.168.2.5 -p 8080	# Detecting server-side software version information
$ sudo nmap -O 192.168.2.5	# Identify the operating system of the target host
$ sudo nmap -sU 192.168.2.5 -p 53,161