rbldnsd(8) on Linux
The text e4759804d9b9, as Debian 5.0 (Lenny), Debian 4.0 (Etch) shipped it.
DNS daemon suitable for running DNS-based blocklists
Flags it lists
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-4 -
-6 -
-A -
-C -
-a -
-b -
-c -
-d -
-e -
-f -
-l -
-n -
-p -
-q -
-r -
-s -
-t -
-u -
-v -
-w