hexdump(1) on OpenBSD
The text 3fbcd425c185, as OpenBSD 4.0, OpenBSD 3.9, OpenBSD 3.8, OpenBSD 3.7, OpenBSD 3.6, OpenBSD 3.5, OpenBSD 3.4 shipped it.
ascii, decimal, hexadecimal, octal dump
Flags it lists
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-C -
-b -
-c -
-d -
-e -
-f -
-n -
-o -
-s -
-v -
-x