Quote:
Originally Posted by Bladewire
I wouldn't let Versaweb or Leaseweb near my sites if I was you.
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Building on that: there's probably companies which sell lists, or more likely, access to an API, which will help you determine whether a particular IP is consumer facing, or more likely to be a server in a data centre. That should help quickly narrow down suspicious IPs. Just remember it won't be 100% accurate.
Another possibility may be to analyse logs and look for patterns that suggest it's not a human using the site interactively. For example, on a forum I run, I found a large number of spammers were "filling in" and submitting the registration form less than one second after loading it.