-sS specifies a SYN stealth (half-open) TCP scan, -O attempts to identify the operating system, and -p lets you specify a port range to scan. -Pn (No ping) This option skips the host discovery stage altogether. Normally, Nmap uses this stage to determine active machines for heavier scanning and to gauge the speed of the network.
-sS (TCP SYN scan) .
SYN scan is the default and most popular scan option for good reasons. It can be performed quickly,
scanning thousands of ports per second on a fast network not hampered by restrictive firewalls. SYN
scan is relatively unobtrusive and stealthy, since it never completes TCP connections. It also works
against any compliant TCP stack rather than depending on idiosyncrasies of specific platforms as
Nmap´s FIN/NULL/Xmas, Maimon and idle scans do. It also allows clear, reliable differentiation
between the open, closed, and filtered states.
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