genetic diversity w/ DNS

no list would be complete without

JEEVES written by Paul Mockapetris

Of course, we need to find a working TOP-20 machine.

IBM had a 370 version of DNS, and I believe Tandem had
a non-BIND version of DNS.

IBM has their own variant on OS/2 Warp Server for e-Business (read Warp 5.0)
that is dynamic (requires a client). Its based on Bind 4.9.n as its code
base, but there must be heavy modifications to it.