nanog mailing list archives
Re: Geo location to IP mapping
From: Michael.Dillon () btradianz com
Date: Tue, 16 May 2006 10:00:59 +0100
As a major caveat, all geolocation services do have some degree of inaccuracy, because the sources of data are very diverse. (Some ISPs provide complete subnet maps to MaxMind and other providers, whereas some data is scraped from WHOIS or provided by inference from end-users.)
And some organizations run their own internal networks across international borders. In other words, knowing that subnet X is allocated to company Y who has a 300 meg Internet connection in city Z, does not mean that all the users of that connection are also in city Z. They could be scattered around the world. This is why some companies use other sources of data to infer the location, i.e. if users of an IP address prefer yahoo.fr to yahoo.com, then that is one datapoint in favour of them being located in France. If you understand the principles of RBL weighting then you will get the idea. --Michael Dillon
Current thread:
- network triangulation (Re: Geo location to IP mapping), (continued)
- network triangulation (Re: Geo location to IP mapping) Edward B. DREGER (May 15)
- Re: Geo location to IP mapping Marshall Eubanks (May 15)
- Re: Geo location to IP mapping Steven M. Bellovin (May 15)
- Re: Geo location to IP mapping sgorman1 (May 16)
- Re: Geo location to IP mapping Charles Cala (May 16)
- Re: Geo location to IP mapping Marshall Eubanks (May 16)
- Re: Geo location to IP mapping Charles Cala (May 16)
- Re: Geo location to IP mapping Kevin Pawloski (May 15)
- Re: Geo location to IP mapping Michael . Dillon (May 16)
- Re: Geo location to IP mapping Edward B. DREGER (May 16)
- Re: Geo location to IP mapping Martin Hannigan (May 15)
- Re: Geo location to IP mapping Kevin Day (May 15)
- Re: Geo location to IP mapping Bill Nash (May 15)
- Re: Geo location to IP mapping Alain Hebert (May 15)