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Where < target > may be a single IP, a hostname or a subnet
-sS TCP SYN scanning (also known as half-open, or stealth scanning)
-P0 option allows you to switch off ICMP pings.
-sV option enables version detection
-O flag attempt to identify the remote operating system
-A option enables both OS fingerprinting and version detection
-v use -v twice for more verbosity.
nmap -sS -P0 -A -v < target >
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