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CAIDA: Cooperative Association for Internet Data Analysis
NetGeo API

About
NetGeo API
NetGeo Server
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A beta distribution of Java and Perl APIs to interact with the NetGeo server is now available: NetGeoClient-1.1.tar.gz
The README.cgi file from the distribution provides some rough documentation. You may also find looking at example scripts useful.
If you simply want to find the lat/long of a large number of ASes, it will be faster to download and parse the automatically generated file at http://netgeo.caida.org/aslatlong.txt. This is generated every Saturday at 10:30pm, Pacific Standard/Daylight Time, and contains a mapping from AS numbers to AS name, country, and lat/long.

Cooperative Association for Internet Data Analysis (CAIDA)
  Last Modified: Thurs Mar-2-2006 23:25:16 PDT
  Maintained by: Alex Ma
  Page URL: http://www.caida.org/tools/utilities/netgeo/NGAPI/index.xml