ipv6pref(1) on Linux
The text 0306cf1b4c52, as Debian 10 (Buster), Debian 9 (Stretch) shipped it.
Flags it lists
-
-p -
-t
The text 0306cf1b4c52, as Debian 10 (Buster), Debian 9 (Stretch) shipped it.
-p
-t