Exceptions to the Standard Subnet Boundary in IPv6 Addressing

Document Type Expired Internet-Draft (individual)
Author David Farmer 
Last updated 2019-02-10 (latest revision 2018-08-09)
Stream (None)
Intended RFC status (None)
Expired & archived
pdf htmlized bibtex
Stream Stream state (No stream defined)
Consensus Boilerplate Unknown
RFC Editor Note (None)
IESG IESG state Expired
Telechat date
Responsible AD (None)
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This document clarifies exceptions to the standard subnet boundary in IPv6 addressing. The exceptions include unicast IPv6 addresses with the first three bits 000, manually configured addresses, DHCPv6 assigned addresses, IPv6 on-link determination, and the possibility of an exception specified in separate IPv6 link-type specific documents. Further, operational guidance is provided, and Appendix A discusses the valid options for configuring the parameters of an IPv6 subnet.


David Farmer (farmer@umn.edu)

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)