PHPipam is an IP Address Management utility written in PHP. Slightly overkill for managing a home network with just one subnet and just a possible 255 different IP addresses for me to manage, but hey, its free and we use it at work so being able to hack about with it in the safety of my own home is quite nice.
However, FreeBSD is not first choice for PHPipam average users so the default locations for Ping and FPing are not where a standard Linux install would expect to find them. For FreeBSD you have to log into your PHPipam landing page and head to the Administration section and amend the path for :
/bin/ping to /sbin/ping note the extra s
and
/bin/fping to /usr/local/sbin/fping
and then network discovery scans should work for you