dnssec-signzone(8) on macOS
The text a36d010eaa05, 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.
DNSSEC zone signing tool
Flags it lists
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-3 -
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-N -
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-g -
-h -
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-l -
-n -
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-r -
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-t -
-u -
-v -
-x -
-z