A couple months ago Google gave a way to
do Googlebot verification. Basically, it involves two steps: a reverse DNS lookup followed by a forward DNS lookup. Now Microsoft has implemented the same DNS policies, so you can use the same method to
verify MSNBot.
Good for them. Who will be next to implement this open method to authenticate search engine bots: Yahoo!, Ask, or
Exalead? Place your bets.
MSFT adds bot verification - Read More...