The prevalence of private address space for IPv4, and the prospect of adoption of IPv6 by at least some domains of application, mean that the traditional method of uniquely identifying an Internet end-point throughout time and space by a 32-bit registry-assigned IPv4 address is no longer universally valid.
Note that this is in the context of (a) IPv4, and (b) IPv6 as currently specified. While Global, Site and End-System Designator (GSE) is not excluded, it is also not the primary focus of this group, especially given the existence of IPv4.
A document making such recommendations, with whatever background material is needed to support these recommendations.
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