fpdns(1p) on Linux
The text 4031233066b2, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 11 (Bullseye) shipped it. The page shows this text now.
DNS server fingeprinting tool
Flags it lists
-
-D -
-F -
-Q -
-S -
-T -
-d -
-f -
-p -
-r -
-s -
-t -
-v