This Recommendation describes the requirements and the mechanisms for object mapping using IPv6 in next generation networks (NGNs). This Recommendation covers the following: Basic concept and requirements of object mapping using IPv6; Mapping architecture and relationships between identifiers; Mechanisms for object mapping using IPv6. This Recommendation does not intend to develop any specific protocols for object mapping. As many new types of devices (i.e., objects) are connected to networks, this Recommendation assumes that IPv6 plays a key role in object-to-object communications. The objective of this Recommendation is to provide guidelines for mapping of information on objects for providing end to-end connectivity in IPv6-based NGN.