I'm pretty sure blacksheep is correct. However, is this what Google is accuse do doing? I was under the impression that they were accused of recording the IPs (and possibly cross referencing them with actual physical addresses). If that's the case, and since even a locked wifi connection provides the current IP address cycling through it, assuming google knows the exact date and time of when the record took place, they could make a nice little database of IP specific locales. the problem I see with that is that most people using a wireless router these days are probably also using a broadband connection, and in the overwhelming majority of cases, those connections use dynamic IP's, so while the information would be useful for google, it would be of no use for anyone else - since google would not have any new IP's that cycled through a modem after the fact.