Slap in the middle of a BT broadband range, albeit a static range, as far as I can tell. Company called ayima according to DNS.
Actually, I have several bad hits plus another small sub-range blocked in 81.144/16 but 34 was the worst at 64 hits in a couple of months. Not sure if the others are "oops" or real bot-ish but highest number of hits on any one IP was 3 so benefit given.
There is actually a fair amount of bad behaviour within the static BT range 81.128/11 - sadly, being in the UK with UK customers, I can't block them all. :(