dstiles - 7:38 pm on Aug 23, 2013 (gmt 0)
I assume it was a google IP - the one you give is a local (private) network IP and so irrelevant.
The IP quoted in the other WebmasterWorld posting was certainly G but not one of their bot IPs. In fact it's in a range 22.214.171.124/16 that has been used in illegal - or certainly immoral - activities in the past (my notes say: this range suspect (apart from known bots) following mocality revelation - http blog[.]mocality[.]co[.]ke/2012/01/13/google-what-were-you-thinking/). I re-enabled the range briefly in June and quickly disabled it again following a lot of bad (ie non-bot) accesses.
My guess, with no knowledge but deep suspicion of G, is that they are testing something they probably do not want us to know about.
My own method of protection is: block ALL G ranges except for small ranges that can be shown by rDNS to be proper crawlers, and then to evaluate known user-agents against those IPs. Works for me, anyway, and for many here. :)