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Internet Atlas Gallery

Core AS Internet Data

Cooperative Assocation for Data Analysis (CAIDA)
San Diego Supercomputer Center (SDSC)
University of California, San Diego (UCSD)

Visualization Thumbnail About the Data
Data Sources:
(Source1): Bill Cheswick, 14 January 2000
(Source2): traceroutes from CAIDA network to Cheswick destinations, 15-22 January 2000
(Source3): 14 skitter data monitors on 8,16,24 January 2000
Data Specification:
(Data1): 220,533 IP addresses (nodes) (220,533 nodes, 374,013 links, and 154,104 target destination IP addresses.)
(Data2): BGP Routing Table of 16 Jan 2000, from the Oregon Route Views Project containing 75,643 total prefixes.
Data Aggregation:
(Aggregate1): IP addresses in 32,798 BGP prefixes were mapped to their best-match origin AS in the BGP Routing Tables, yielding 5,107 AS nodes. Each of these AS nodes approximately maps to an ISP.
(Aggregate2): Outdegree and indegree are calculated by breaking down the directional paths that skitter collects into their corresponding links. Then, counting the number of links that start in a given AS and end in another represents its outdegree. Likewise, the number of links starting elsewhere that end up in a given AS represent its indegree.
Data Filters:
(Filter1): Remove leaf nodes.
(Filter2): Remove nodes with an out-degree of zero.
(Filter3): Remove 2-loops (two nodes with outgoing edges connected only to each other.)
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