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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: IP->Country Data (RE: ISP's Contact List)
----- Original Message ----- From: "william(at)elan.net" <[email protected]> To: "Jim McBurnett" <[email protected]> Cc: <[email protected]> Sent: Monday, June 13, 2005 2:55 PM Subject: RE: IP->Country Data (RE: ISP's Contact List) > > > On Mon, 13 Jun 2005, Jim McBurnett wrote: > > > I'm sure that this made it here before but: > > > > www.analysespider.com/ip2country/ip_country.html > > Commercial service when there are several free ones available.... > > BTW - based on what I can see they are not updating data once per day but > only once/month. Also having some experience in this matter I highly doubt > that its much more accurate then what I got - it appears no matter what > path you take to get the data, it would to a degree be wrong (difference > being which part is wrong). One possible way to resolve some issues could > be to have testing servers placed in several locations and analyze TTL for > connections to various ips to determine how far its from several servers - > of course it would also not be accurate as ip networks are not necessarily > interconnecting in the same region (CAIDA did their best with this method > some time ago but have not kept updated data as far as I know). the most accurate systems i am aware of use online purchase statistical data to increase accuracy. someone purchases a blue widget online, from a certain ip address and with a credit card with a certain billing zip code, and voila - they now have an idea of where that ip might be. of course, this works best (only?) for residential ip addresses in broadband-enabled neighbourhoods, but it's pretty darn good at telling me where i am (within 5-10 miles). -p
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