Off hand I would say that from your IP number they can get as close as your ISP. Then with a court order, or inside help they could get your name and address. I think a good hacker could break into the ISP, may or may not find your name and address that way. It would be hard, they would have to cross reference several files, I would think.
If the ISP is doing security correctly the IP number would link to a client number, another file would have the client name to client number, Myself I would put that file on a computer that had no links to the internet, may be on a removable hard drive that could be under lock and key when not in use. Use the two man rule when using the file.
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