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Do ISPs keep records of user-assigned dynamic IP addresses?

Does an ISP keep records in a database of the dynamic IP address it assigns to a user -- and when and from what telephone number that user connected?
It varies depending on the ISP, but the short answer is "yes." They have ways of tracking you down -- not because the ISP is interested in what you're doing, but because ISPs are often served with subpoenas and required by law to identify users.
This was last published in October 2002

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