Unlike CSI, there really isn't much one can do with an IP address other than get a vague idea of what part of the world a device might be in. If that.Could they not associate it with your IP address which they might use in ways I can't even imagine.
For example, right now using a IP to location database any advertiser would get that my PC is located in DD1 but little more than that. At the same time, if I was to access the site from my phone it would believe that I am in Gloucester.