Nmap is the ideal tool for performing a simple network inventory or vulnerability assessment. By 
default, Nmap performs a SYN Scan, which works against any compliant TCP stack, rather than depending on idiosyncrasies of specific platforms. It can be used to quickly scan thousands of ports, and it allows clear, reliable differentiation between ports in open, closed and filtered states.
To perform a SYN scan on the host www.yourorg.com, use the command
nmap www.yourorg.com
Though not essential, it’s best if you have root access on your Unix or Linux machine, or use an administrator account on Windows, as most of the scan types send and receive raw packets, and so are only available to privileged users. If you don’t have the necessary privileges or you are scanning an IPv6 network, use the command
nmap –sT www.yourorg.com Nmap: Scanning ports and services
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