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I've been deriving some amusement from a Ukrainian robot calling itselfMozilla/5.0 (compatible; bingbot/3.0-alpha; +http://www.bing.com/bingbot.htm)
It crawls from 46.118.various. Lending verisimilitude to the UA, it asks for robots.txt as many as five times on a single visit.
They're not all Ukrainian server farms in those ranges.
They're not server farms at all, just a few compromised accounts.