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A search of webmasterworld turns up a listing for the class C in the perfect .htaccess ban list thread, but I didn't see any explanation.
Last night, 212.95.252.16 was resolving to dex-252-16.dxi.net. Today, it's resolving to lager.netcraft.com.
Maybe it was some temporary rDNS wackiness that got corrected or worked itself out. I wish netcraft would just identify themselves rather than spoofing a user agent.