rtadvd(8) on FreeBSD
The text cf6d6f75e85c, as FreeBSD 13.2-RELEASE, FreeBSD 13.1-RELEASE, FreeBSD 13.0-RELEASE shipped it.
router advertisement daemon
Flags it lists
-
-C -
-D -
-M -
-R -
-c -
-d -
-f -
-p -
-s