Orange This document provides a set of guidelines for YANG module authors related to the design of IANA-maintained modules. These guidelines are meant to leverage existing IANA registries and use YANG as another format to present the content of these registries when appropriate. This document updates RFC 8407 by providing additional guidelines for IANA-maintained modules. Also, this document updates RFC 8126 by providing additional guidelines for writing the IANA considerations for RFCs that specify IANA-maintained modules. This document does not change anything written in RFC 8407 and RFC 8126.