unbound-anchor(8) on Linux
The text 254b25424dd9, as Debian 10 (Buster) shipped it.
Unbound anchor utility.
Flags it lists
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-4 -
-6 -
-C -
-F -
-P -
-R -
-a -
-c -
-f -
-h -
-l -
-n -
-r -
-s -
-u -
-v -
-x