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 endto- end connectivity in IPv6-based NGN.