dnstracer(8) on Linux
The text bc83f9b440fe, as Debian 4.0 (Etch), Debian 3.1 (Sarge) shipped it.
trace a chain of DNS servers to the source
Flags it lists
-
-4 -
-C -
-S -
-c -
-o -
-q -
-r -
-s -
-v