Highly Connected Autonomous Systems and Routers
The Weekly Routing Reports used by the ISP community come from the Asia-Pacific Network Information Centre (APNIC) router in Tokyo, which is a well-connected router that has as good a view of the Internet as any other single router. For serious routing research, however, routing information will be captured at multiple well-connected sites, including high-traffic ISPs (see the "skitter core") below.
As of September 17, 2011, there were 371690 routes seen by the APNIC router. These came from 38823 autonomous systems, of which only 134 were transit-only and 32200 were stub/origin-only. 5208 autonomous systems provided some level of transit.
Read more about this topic: Default-free Zone
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