dnssec-importkey(8) on macOS
The text 3b277e4472b4, as macOS 10.13.3, macOS 10.13.2, macOS 10.13.1, macOS 10.13 shipped it.
Import DNSKEY records from external systems so they can be managed.
Flags it lists
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-D -
-K -
-L -
-P -
-V -
-f -
-h -
-v