This is an announcement of an IETF-wide Call for Comment on draft-iab-carisreport-00. The document is being considered for publication as an Informational RFC within the IAB stream, and is available for inspection at: https://datatracker.ietf.org/doc/draft-iab-carisreport/ The Call for Comment will last until 2016-7-06. Please send comments to architecture-discuss@ietf.org and iab@iab.org. Abstract The Internet Architecture Board (IAB) and the Internet Society (ISOC) hosted a day-long Coordinating Attack Response at Internet Scale (CARIS) workshop on 18 June 2015 in coordination with the Forum for Incident Response and Security Teams (FIRST) Conference in Berlin. The workshop included members of the FIRST community, attack response working group representatives, network and security operators, Regional Internet Registry (RIR) representatives, researchers, vendors, and representatives from standardisation communities. Key goals of the workshop were to improve mutual awareness, understanding, and coordination among the diverse participating organizations and their representatives. The workshop also aimed to provide the attendees with greater awareness of existing efforts to mitigate specific types of attacks, and greater understanding of the options available to collaborate and engage with these efforts.