This document describes a general architecture for a reputation-based service, allowing one to request reputation-related data over the Internet, where "reputation " refers to predictions or expectations about an entity or an identifier such as a domain name. The document roughly follows the recommendations of RFC 4101 for describing a protocol model. Status of This Memo This is an Internet Standards Track document. This document is a product of the Internet Engineering Task Force (IETF). It represents the consensus of the IETF community. It has received public review and has been approved for publication by the Internet Engineering Steering Group (IESG). Further information on Internet Standards is available in Section 2 of RFC 5...