rpc.idmapd(8) on Linux
The text 5346311163ee, as Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch) shipped it.
NFSv4 ID <-> Name Mapper
Flags it lists
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-C -
-S -
-c -
-f -
-h -
-p -
-v