Without scanning those uncommon ports, you may be missing these services. In addition, some applications use less common ports that are not included in that default scan range.
However, sneaky system administrators may run services on uncommon ports, practicing security through obscurity.
This will catch most common open TCP ports that are in use. An example of this would be port 31337 which was commonly used for Back Orifice.īy default, Nmap scans over 1000 ports for common services. The ports returned as open are listed along with what service the ports correspond to based on port registrations from the Internet Assigned Numbers Authority (IANA) and commonly used ports. This produces a listing of the open ports on the target as well as possibly open/filtered ports if the target is behind a firewall.
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