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I'm looking for a list or lists of address blocks / subnets of potentially malicious or unfruitful / known botnets or Google scrapers. The purpose of this is to help to eliminate bot clicks / scrapes and simply unfruitful clicks on AdWords campaigns via the "IP address exclusion" function. Where can I find lists of this nature?

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Adwords will not count visits from Googlebot, I don't believe. And blocking entire subnets is a bad idea, because many times the malicious ones change, so what's malicious one week could be a regular user another. And the other way around. – ionFish Sep 8 '12 at 2:00
About 7-30% of monthly searches are bots scraping keywords and various other SEO/SEM applications. Most of these come from some very specific subnets in terms of specific nations, however a few of these nations are target audiences for this product. I would prefer to minimize the potential abuse that will ultimately cost money. These particular demographics are not worth that risk and therefore I would like to block what I possibly can while still offering some ads. – ylluminate Sep 8 '12 at 3:29

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