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They probably acquired such large IP ranges, at great cost and with much paperwork, that they had their pick of the cutesy ones.
Try pinging 1.1.1.1 - it's a valid IP...
Several years back I was impressed to see one of the domain crawling sites using 66.249.x.x as its IP. Most people allow this because Google (and Googlebot) occupy a large chunk of that range, but there are several IPs which are not allocated to Google. Wonder how much they paid to get a block right near Google.
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