[mike_d]

I can't nail down the exact date, but I believe PowerDNS 2.0 shipped sometime around 2001-2002 with pipe backend support. It allowed you to craft dynamic responses to DNS queries from any language you could get to run on Linux.

[Raineer]

Yeah this was my thought, too. I was using PowerDNS to do this sort of thing within a basic home environment. But I have no idea if it has the necessary features to keep a production environment happy. It was fun to play with.