portmap(8) on OpenBSD
The text b1836fd882e9, as OpenBSD 5.8, OpenBSD 5.7, OpenBSD 5.6, OpenBSD 5.5, OpenBSD 5.4, OpenBSD 5.3, OpenBSD 5.2, OpenBSD 5.1, OpenBSD 5.0, OpenBSD 4.9 shipped it.
DARPA port to RPC program number mapper
Flags it lists
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-d