AS Rank: Data Sources - CAIDA : http://as-rank.caida.org

AS Rank: Data Sources

This page presents the BETA version of AS Rank, CAIDA's ranking of Autonomous Systems (AS) (which approximately map to Internet Service Providers) and organizations (Orgs) (which are a collection of one or more ASes). This ranking is derived from topological data collected by CAIDA's Archipelago Measurement Infrastructure and Border Gateway Protocol (BGP) routing data collected by the Route Views Project and RIPE NCC.

ASes and Orgs are ranked by their customer cone size, which is the number of their direct and indirect customers. Note: We do not have data to rank ASes (ISPs) by traffic, revenue, users, or any other non-topological metric.

AS Ranking Org Ranking Information for a single AS Information for a single Org Background Data Sources Help

At the bottom of each data table we list the data sources used, in the following format:

data sources
attribute	type	date	sources


attribute	The attribute, or collection of attributes, whose data sources are listed. name - The name of the organization that owns/operates the AS number. country - The country listed as either the delegation country, organization address, or contact address, in that order, depending on which data is available. topology - The collection of attributes that describe topological characteristics we can infer from the AS paths. topology (router) - The collection of attributes that describe topological characteristics we can infer from the router graph.

type	The type of data used. ASN allocation - List of AS numbers allocated by IANA to Regional Internet Registries (RIR), who then have stewardship responsibility for maintaining an authoritative whois database entry on each ASN assigned to them. http://www.iana.org/assignments/as-numbers/as-numbers.txt delegated - Each RIR provides a list of delegations in its region. In some cases they only list vague geographic regions (e.g., "EU") in which case we need another source of data. ftp://ftp.afrinic.net/pub/stats/afrinic/delegated-afrinic-latest ftp://ftp.apnic.net/pub/stats/apnic/delegated-apnic-latest ftp://ftp.arin.net/pub/stats/arin/delegated-arin-latest ftp://ftp.ripe.net/pub/stats/ripencc/delegated-ripencc-latest ftp://ftp.lacnic.net/pub/stats/lacnic/delegated-lacnic-latest WHOIS - Each RIR provides a dump of of their Whois database for research purposes. The "Whois" is a collection of semi-public databases run by the RIRs to provide registrar or assignee information on Internet resources. We use whois data to get the name of the organization and country of operation for each AS. autnum.txt - We use Geoff Huston's list of ASN organization names to supplement APNIC's whois data set, since the APNIC's dump does not contain information on the ASN assigned by the Local Internet Registries LIR in its region. http://www.potaroo.net/bgp/iana/asn.txt BGP - Border Gate Way protocol (BGP) is the primary global routing protocol. Part of this protocol propagates AS routing paths. At least two organizations collect BGP feeds and publish them in standard formats it as a public service. http://www.routeviews.org/ http://www.ripe.net/projects/ris/rawdata.html ITDK - The Internet Topology Data Kit (ITDK) contains router level data about connectivity and routing gathered from a large cross-section of the global Internet. Netacuity - is a commercial service providing geolocation for Internet name and number resources. We use it to supplement the AS organization and country names obtained from Potaroo and the RIRs. GeoLite City - is a free database providing geolocation for IPv4 addresses. We use it to geolocate the router-level topology.

date	The date when the data was collected. YYYY.MM.DD - Y:year M:month D:day

sources	List of sources from which the given data was collected. ARIN - The RIR for Canada, many Caribbean and North Atlantic islands, and the United States. AfriNIC - The RIR for Africa. APNIC - The RIR for Asia, Pacific region. LACNIC - The RIR for Latin America and the Caribbean. RIPE NCC - The RIR for Europe and parts of Asia. IANA - An organization that oversees IP address, Top-level domain and Internet protocol code point allocations. Potaroo.net - Geoff Huston's web site. Route Views Project - University of Oregon project to collect global BGP routing information. Netacuity - is a commercial service providing geolocation for Internet name and number resources. Used to supplement the AS organization and country names obtained from Potaroo and the RIRs. GeoLite City - is a free database providing geolocation for IPv4 addresses. Used to geolocate the router topology.

Support for this work is provided by the U.S. Department of Homeland Security's Science and Technology Directorate (Project N66001-08-C-2029), the National Science Foundation Internet Laboratory for Empirical Network Science (Project CNS-0958547), and Cisco's University Research Program.