914 did a good job of answering your question.

Personally, I don't mind an occasional off-topic question, if it's technical... or a quick diversionarry type.

It's a good thing that 914 got to you question before I did, because DNS is a HUGE subject and I was going to ask about a zillion questions on what EXACTLY you needed... oh well, I'll have to geek-out on someone else. :-(