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68.7.9.187 Cox Communications, Inc, an ISP. Contact abuse@cox.net
66.27.117.110 Roadrunner, another ISP. Contact abuse@rr.com
You can look these up yourself using resources such as ARIN [arin.net].
Do you have any user-agents, or any other info available from your logs? Providing as much info as you can here will help to get you better answers.
Hope this helps,
Jim
Who knows? - Can't tell from what you've posted.
Can you see any pattern in the pages/files they loaded? Do you really have that many pages on your site, or are they retrieving the same pages repeatedly? Are all the pages they are retrieving valid (do they exist), or are these 'bots "shotgunning" your site, trying all possible variations of common filenames?
Again, the more info you provide, the better quality response you'll get here...
Whatever they are up to, they are loading pages at an excessive rate, and should be banned by IP for that alone, IMHO.
Jim
Such spiders are difficult to block based on their identity. One must use sophisticated and persistent monitoring software that tracks ongoing visitor sessions and possesses the ability to immediately block offending users based on a various rules, like a maximum request limit in your case.
In any other case and sadly enough, the only truly effective measurement is to reduce your seemingly excessive amount of documents available to the public ;)