host(1) on Linux
The text a3b646fa6a6e, as Debian 10 (Buster) shipped it.
DNS lookup utility
Flags it lists
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-4 -
-6 -
-C -
-N -
-R -
-T -
-U -
-V -
-W -
-a -
-c -
-d -
-i -
-l -
-m -
-r -
-s -
-t -
-v -
-w