Routeviews Prefix to AS mappings Dataset (pfx2as) for IPv4 and IPv6

Description

This dataset contains IPv4/IPv6 Prefix-to-Autonomous System (AS) mappings derived from RouteViews data. Files are created on a daily basis, starting from 2005-05-09 for IPv4 and 2007-01-01 for IPv6. The file format is line-oriented, with one prefix-AS mapping per line. The tab-separated fields are:

IP prefix
prefix length
AS number

More detailed information can be found in the README for this dataset. Files from this dataset can be used by CAIDA's ASFinder and various CoralReef tools (for example in the t2_convert -R option).

Note on Multi-origin ASes (MOASes)

The file format changed slightly beginning with the 2010-10-27 prefix-to-AS file. Previously, ASes were listed in sorted order in MOASes (for example, we said "10_20_30" and never "30_10_20"). Now, we sort the ASes according to their frequency of appearance as an origin AS in the source BGP table. For example, suppose 10.0.0.0/8 is advertised by the ASes 10, 20, and 30, and suppose 7 RouteViews peers saw AS 10 as the origin AS, 4 saw AS 20 as the origin AS, and 29 saw AS 30 as the origin AS. Then the MOAS recorded in the prefix-to-AS file will be 30_10_20, according to descending frequency of appearance as an origin AS. If there is a tie in frequency, then we sort by lexicographical order. With the new sorting order, users who wish to choose "the best" mapping for simplicity (with full understanding of the caveats) can simply pick the first listed AS.

Acceptable Use Agreement

Access to these data is subject to the terms of the following CAIDA Acceptable Use Agreement (printable version in PDF format)
CAIDA ACCEPTABLE USE AGREEMENT for PUBLICLY ACCESSIBLE DATASETS The following terms comprise the Acceptable Use Policy and Data License Agreement for all publicly accessible datasets (the "Public Agreement") made available by the Center for Applied Internet Data Analysis (CAIDA), a research unit at the University of California San Diego (UCSD) and governed by The Regents of the University of California. LICENSE CAIDA's authorization to access the data grants You a limited, non-exclusive, non-transferable, non-assignable, and terminable license to copy, modify, and use the data in accordance with this Public Agreement. No license is granted for any other purpose and there are no implied licenses in this Agreement. Nothing in this License is intended to limit any rights You may have arising from fair use or due to other limitations on CAIDA's exclusive rights under copyright law or other applicable laws. CAIDA has the authority and reserves the right, in its sole discretion, to discontinue further access and use to anyone who violates this AUA. If You create a publication (including web pages, papers published by a third party, and publicly available presentations) using data from this dataset, You should cite the data as follows: The CAIDA UCSD [DataSet Name] - [dates used], https://www.caida.org/data/[dataset-URL] We encourage You to provide CAIDA with a copy of (or a link to) the publication. We use this information in reports to our funding agencies. DISCLAIMER OF WARRANTIES. CAIDA USES ITS BEST EFFORTS TO PROVIDE DATA IN ACCORDANCE WITH ETHICAL PRINCIPLES AND SCIENTIFIC INTEGRITY. HOWEVER, THE DATA PROVIDED HEREIN IS ON AN "AS IS" BASIS. NEITHER CAIDA, ITS RESEARCHERS, RESEARCH PARTNERS, LICENSORS, AND DATA PROVIDERS, NOR THE UNIVERSITY OF CALIFORNIA AND ITS TRUSTEES, OFFICERS, EMPLOYEES, AND AGENTS MAKE ANYWARRANTY, EITHER IMPLIED OR EXPRESS, OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, INCLUDING, BUT NOT LIMITED TO, THE ACCURACY, TIMELINESS, COMPLETENESS, RELIABILITY, OR AVAILABILITY OF CAIDA DATA, APPLICATIONS, OR SERVICES ACCESSIBLE THROUGH OR MADE AVAILABLE BY CAIDA. LIMITATION OF LIABILITY. TO THE EXTENT ALLOWED BY LAW, IN NO EVENT SHALL CAIDA AND THE UNIVERSITY OF CALIFORNIA BE LIABLE TO YOU OR ANY THIRD PARTY FOR ANY INDIRECT, CONSEQUENTIAL, INCIDENTAL, SPECIAL OR PUNITIVE DAMAGES, ARISING FROM YOUR USE OF THE DATA. If You have any questions about the data or about this Public Agreement, please email data-info@caida.org.

When referencing this data (as required by the AUA), please use:

Routeviews Prefix to AS mappings Dataset for IPv4 and IPv6 https://www.caida.org/data/routing/routeviews-prefix2as.xml

Also, please, report your publication to CAIDA.

Data Access

Download Routeviews Prefix to AS mappings for IPv4 and IPv6 data.