There are two recent threads about msnbot-media visiting from the 131.253.41. range:
...] (1 month ago)
...] (2 months ago)
I've had them set to Ignore all along, because they're well-behaved on my site. (ymmv, as shown in those earlier threads). Yesterday for the first time I met the ordinary bingbot from the same neighborhood:
126.96.36.199 - - [31/Aug/2012:21:33:15 -0700] "GET /robots.txt HTTP/1.1" 200 911 "-" "Mozilla/5.0 (compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm)"
188.8.131.52 - - [31/Aug/2012:22:36:07 -0700] "GET /fun/AlonzoMelissa.html HTTP/1.1" 200 10423 "-" "Mozilla/5.0 (compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm)"
That's .47. while all the mediabots have used .41. in the same range. But again, unmistakable bingbot behavior, with more requests for robots.txt than for pages.
D'you suppose it's got something to do with the spike in bingbot activity reported elsewhere? 157.55. got too crowded so they had to outsource? :: minor detour here to cross-check search and discover that amazon has the brazen gall to label something as "copyrighted material" although it is scraped from Project Gutenberg and therefore by definition in the public domain ::