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.