The 'serial-1' directory contains AS relationships inferred using the method described in "AS Relationships, Customer Cones, and Validation" published in IMC 2013 (http://www.caida.org/publications/papers/2013/asrank/). The as-rel files contain p2p and p2c relationships. The format is: ||-1 ||0 The ppdc-ases files contain the provider-peer customer cones inferred for each AS. Each line specifies an AS and all ASes we infer to be reachable following a customer link. The format is: .. ------------------------ Acceptable Use Agreement ------------------------ The AUA that you accepted when you were given access to these datas is included in pdf format as a separate file in the same directory as this README file. When referencing this data (as required by the AUA), please use: The CAIDA AS Relationships Dataset, http://www.caida.org/data/active/as-relationships/ Also, please, report your publication to CAIDA (http://www.caida.org/data/publications/report-publication.xml).