[Geowanking] City Detection

Anthony Townsend anthony at nycwireless.net
Tue Aug 12 13:59:19 PDT 2003

Most of the companies that do this (Quova, Digital Envoy, Akamai) use a 
combination of about 5 data sources on routers and domains, router 
names, known data about latency between city pairs on different 
networks, and guesswork.

It's accurate enough at the national level for all kinds of 
applications, but I've yet see any well-executed city level uses.

On Friday, August 8, 2003, at 05:59  am, [NetTrackers] wrote:

> Hi
>      I have been looking around the net for a few resources on City
> detection via the IP address and i've seen some sites which do offer 
> the
> service.
>     Tried some and they do have an above average (80%++) hit rate 
> which is
> quite commendable in my view.
>     I cant understand how you could actually get the city name from 
> the IP
> address. I had a look at the ripe, arin,.. databases and they go as 
> far as
> country but that wont get my city data for sure.. Nor longtitude or 
> latitude
> which i found in some of these databases.
>     Could someone give me a few pointers here ? I contacted Nigel W. 
> who is
> running the javainetlocator project at sf.net -- but i still dont see 
> how i
> can get any acurate results just from parsing their databases.. I 
> could push
> in some country capitals if the city is not found (which is true for 
> most
> cases !) But that wouldnt get me much accuracy.
>     So if anyone has ideas about how i could go ahead on this i would 
> love
> to hear them!
> Thanks
>     Dhruv
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