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I've them crawling during may of 2008, and denied since then.
However, not sure I recall seeing one of their users switch both UA's and IP's (West coast to East Coast) this fast?
Poked around on their website for a geographical area coverage without success.
64.184.179.zz - - [14/Jan/2009:16:40:51 -0600] "GET /folder/SubFlder/mypage.html HTTP/1.1" 403 - "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; .NET CLR 1.0.3"
74.77.104.zzz - - [14/Jan/2009:16:40:51 -0600] "GET /SameFolder/SameSubFlder/Samepage.html HTTP/1.1" 200 39385 "http://www.google.com/search?hl=en&rlz=1G1GGLQ_ENUS302&q=on+topic+search+widget" "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; .NET CLR 3.0.04506)"
<CSS and page images>
64.184.179.zz - - [14/Jan/2009:16:40:53 -0600] "GET /favicon.ico HTTP/1.1" 403 - "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; .NET CLR 1.0.3"
74.77.104.zzz - - [14/Jan/2009:16:40:53 -0600] "GET /favicon.ico HTTP/1.1" 200 318 "-" "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; .NET CLR 3.0.04506)"
It used the same malformed UA as yours and likewise got a 403 for all requests.
No IP switching in my case - but your second example seems to be RoadRunner.
Lots of odd behaviour comes from there, I assume proxy related (but just guessing).
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