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I checked my logs and there are several fetches from 72.94.249.37 and 72.94.249.38, over a number of domains that I host. None are particularly popular as far as the greater internet is concerned; one is a semi private site that I set up for my daughter's photos, another is one that has not yet been developed, apart from a few words of text and an image.

Interestingly, the fetches do not have a user-agent that identifies itself as the DDG crawler:

Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322)

I'm assuming this is the crawler because it does not fetch anything besides text/html.

That's interesting.

Gabriel, does DuckDuckGo's crawler have a distinct user agent? Can you talk more about how DuckDuckGo observes/respects robots.txt?

Follow up to this (its been a week so probably nobody will see this)

http://techzinglive.com/page/1028/179-tz-interview-gabriel-w...

around the 70 minute mark Gabriel mentions that DuckDuckBot is mostly about determining if pages are spam.

No, it crawls non-Alexa sites too. I host two sites, one PR4 with Alexa rank 1.6+ million and another with PR3 and no Alexa rank. Only the latter one was accessed in the last year according to my servers access logs (and only with a single "GET /" request).