nmap is a powerful network scanner that provides port scanning, OS and service identification, and more.
After installing the package,
nmap will be available at Diagnostics >
nmap as well as in the shell (SSH or Console).
The nmap package also installs an OUI database that is used by the pfSense® software GUI to display manufacturer names on pages that list MAC addresses, such as the ARP Table, and DHCP Leases.
This package is currently supported by Netgate TAC to those with an active support subscription.