lucy24 - 9:59 pm on Apr 21, 2013 (gmt 0)
:: detour to double check ::
Wow, longer list than I thought. In addition to the faviconbot, I've got 74.125 listed as
Preview; Wireless Transcoder; urlresolver; Rich Snippets
No relation to the recently arrived snippetbot, which I'd briefly flagged as "no skin off my nose" but did a 180 when I found it snipping at my test site.
The faviconbot benefits from a special dispensation: requests for the favicon are exempted from the ordinary mod_auth blocks (including null UA). It's a, uhm, corollary beneficiary; the rule is intended to flag humans who got locked out by mistake.