idnconv(1) on macOS
The text f57d81a842ae, as Mac OS X 10.8.1, Mac OS X 10.8, Mac OS X 10.7.4, Mac OS X 10.7.3, Mac OS X 10.7.2, Mac OS X 10.7.1, Mac OS X 10.7 shipped it.
codeset converter for named.conf and zone master files
Flags it lists
-
-A -
-B -
-C -
-N -
-U -
-a -
-alias -
-c -
-conf -
-delimiter -
-flush -
-i -
-in -
-localmap -
-n -
-nameprep -
-noasciicheck -
-nobidicheck -
-noconf -
-nolengthcheck -
-nonameprep -
-noroundtripcheck -
-nounassigncheck -
-o -
-out -
-r -
-reverse -
-v -
-version -
-w -
-whole