Reference

ipmon(8) on FreeBSD

The text b692e04fbe45, as FreeBSD 14.5-RELEASE, FreeBSD 14.4-RELEASE, FreeBSD 14.3-RELEASE, FreeBSD 14.2-RELEASE, FreeBSD 14.1-RELEASE, FreeBSD 14.0-RELEASE, FreeBSD 13.5-RELEASE, FreeBSD 13.4-RELEASE, FreeBSD 13.3-RELEASE shipped it.

monitors /dev/ipl for logged packets

Flags it lists

ipmon(8) on FreeBSD now