Fastly Amazon Web Services This document defines a Cryptographic Message Syntax (CMS) protected content type for use with the Resource Public Key Infrastructure (RPKI) to carry a general-purpose listing of Autonomous System Numbers (ASNs) and/or pointers to other groupings of ASNs, called an ASGroup. Additionally, the document specifies a mechanism for ASN holders to opt-out of being listed in a given ASGroup. The objective is to offer a RPKI-based successor to plain-text RFC 2622 'as-set' class objects. When validated, an ASGroup confirms that the respective ASN holder produced the ASGroup object.