IP number by city database

I know this is off topic, but I am looking for some suggestions. I am working on a student project, where I take reverse DNS site addresses and calcualte their IP numbers based on the IP address. I want to make an interactive geo-plotter, where a city on a world map image lights up when the IP number from that city is requested by the user. Everything is fine from the code side, except I can't find a table or list of cities by their IP number. I can find country by IP number, but not city. Anybody know where I can get one of these...uh, ideally for free?
Thanks, Steve

IPs have nothing to do with geographic region.That is not entirely correct. The IANA assigns
IP-addresses to RIRs (Regional Internet Registry) who
in turn assign these to ISPs in that region. I don't
know the exact details but you can read more about it
here: http://www.iana.org/ipaddress/ip-addresses.htm
Correct but the reverse is not true either. It is certainly the case that some IPs can be regionally located. There are a number of small companies with a local presence that have C networks.
But there are larger networks which span geographic regions that are certainly larger than a city. I believe this is how most ISPs work. And presuming that most traffic originates with ISPs these days it would suggest that most originating IPs will not be localizable to a city.

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