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Someone gets a virus, either server or broadband, and Wham! I see quite a few day by day.
Yes in a way from the server logs, but now what?
However. I've long believed that the major US internet providers leave open specific IP's (for what ever their requirements are), which allows others to utilize the same open-IP's as proxies.
How would one determine, what IP's remain active and open-for-use and which ones were previously corrupted by virus/malware?