I don't know, if this is already suggested, but I suggest, that you add an option to only list spiders with at least X Hits in the list of unknown spiders and perhaps add a link to 'List all unknown spiders' then. especially these garbled user agents, like 'cblbshjhbjdmpvrbfdrvv5arh5wi' for example seem to me like some crappy configured firewall or proxy, which tries to hide the user-agent ...
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