GoogleBot

[doughayman]

Assuming that I have reverse DNS look-up enabled on my webserver, can I always expect Google's crawler IP to translate to "GoogleBot"? In other words, are there ever any instances, to anyone's knowledge, where Google's Bot will not resolve to a "GoogleBot" DNS name, and just show up as a plain old IP address in the web log?

Thanks in advance!

[MThiessen]

can I always expect Google's crawler IP to translate to "GoogleBot"?

No

Because G looks for cloakers and other such things and does not publically announce all of it's crawlers.

[tedster]

This post on the official Google Webmaster Central blog gets into some details.

hhttp://googlewebmastercentral.blogspot.com/2006/09/how-to-verify-googlebot.html