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IETF RFC 8190
Last modified on Tuesday, June 27th, 2017
 Permanent link to RFC 8190
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Internet Engineering Task Force (IETF) R. Bonica
Request for Comments: 8190 Juniper Networks
BCP: 153 M. Cotton
Updates: 6890 PTI
Category: Best Current Practice B. Haberman
ISSN: 2070-1721 Johns Hopkins University
L. Vegoda
ICANN
June 2017
Updates to the Special-Purpose IP Address Registries
 Abstract
This memo updates the IANA IPv4 and IPv6 Special-Purpose Address
Registries to address issues raised by the definition of a "global"
prefix. It also corrects several errors in registry entries to
ensure the integrity of the IANA Special-Purpose Address Registries.
This memo updates RFC 6890.
Status of This Memo
This memo documents an Internet Best Current Practice.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
BCPs is available in Section 2 of RFC 7841.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/RFC 8190.
Bonica, et al. Best Current Practice PAGE 1 
RFC 8190 Special-Purpose Address Registries June 2017
Copyright Notice
Copyright (c) 2017 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 3
2.1. Definition of Globally Reachable . . . . . . . . . . . . 3
2.2. Updates to the IPv4 Special-Purpose Address Registry . . 4
2.3. Updates to the IPv6 Special-Purpose Address Registry . . 4
3. Security Considerations . . . . . . . . . . . . . . . . . . . 4
4. References . . . . . . . . . . . . . . . . . . . . . . . . . 5
4.1. Normative References . . . . . . . . . . . . . . . . . . 5
4.2. Informative References . . . . . . . . . . . . . . . . . 5
Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 5
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 6
Bonica, et al. Best Current Practice PAGE 2
RFC 8190 Special-Purpose Address Registries June 2017
1. Introduction
In order to support new protocols and practices, the IETF
occasionally reserves an address block for a special purpose. For
example, [RFC 1122] reserves an IPv4 address block (0.0.0.0/8) to
represent the local (i.e., "this") network. Likewise, [RFC 4291]
reserves an IPv6 address block (fe80::/10) for link-local unicast
addresses.
Several issues have been raised with the documentation of some of the
special-purpose address blocks in [RFC 6890]. Specifically, the
definition of "global" provided in [RFC 6890] was misleading as it
slightly differed from the generally accepted definition of "global
scope" (i.e., the ability to forward beyond the boundaries of an
administrative domain, described as "global unicast" in the IPv6
addressing architecture [RFC 4291]).
This memo updates the definition of "global" from [RFC 6890] for the
IPv4 and IPv6 Special-Purpose Address Registries, augments the fields
contained within the registries in order to address the confusion
raised by the definition of "global", and corrects some errors in
some of the entries in the Special-Purpose Address Registries.
This memo updates [RFC 6890].
2. IANA Considerations
2.1. Definition of Globally Reachable
[RFC 6890] defined the term "global" without taking into consideration
the multiple uses of the term. Specifically, IP addresses can be
global in terms of allocation scope as well as global in terms of
routing/reachability. To address this ambiguity, the use of the term
"global" defined in [RFC 6890] is replaced with "globally reachable".
The following definition replaces the definition of "global" in the
IANA Special-Purpose Address Registries:
o Globally Reachable - A boolean value indicating whether an IP
datagram whose destination address is drawn from the allocated
special-purpose address block is forwardable beyond a specified
administrative domain.
The same relationship between the value of "Destination" and the
values of "Forwardable" and "Global" described in [RFC 6890] holds for
"Globally Reachable". If the value of "Destination" is FALSE, the
values of "Forwardable" and "Globally Reachable" must also be FALSE.
Bonica, et al. Best Current Practice PAGE 3
RFC 8190 Special-Purpose Address Registries June 2017
The "Global" columns in the IPv4 Special-Purpose Address Registry
(https://www.iana.org/assignments/iana-ipv4-special-registry) and the
IPv6 Special-Purpose Address Registry
(https://www.iana.org/assignments/iana-ipv6-special-registry) have
been renamed to "Globally Reachable".
2.2. Updates to the IPv4 Special-Purpose Address Registry
o Limited Broadcast prefix (255.255.255.255/32) - The Reserved-by-
Protocol value has changed from False to True. This change was
made to align the registry with reservation of the limited
broadcast address with Section 7 of [RFC 919].
2.3. Updates to the IPv6 Special-Purpose Address Registry
The following changes to the "IPv6 Special-Purpose Address Registry"
involved the insertion of two new footnotes. These additions
required that the footnotes be renumbered.
o TEREDO prefix (2001::/32) - The Globally Reachable value has
changed from False to "N/A [2]". The [2] footnote now states:
* See Section 5 of [RFC 4380] for details.
o EID Space for LISP (2001:5::/32) - All footnotes have been
incremented by 1.
o 6to4 (2002::/16) - All footnotes have been incremented by 1.
o Unique-Local (fc00::/7) - The Globally Reachable value has changed
from False to "False [7]". The [7] footnote now states:
* See [RFC 4193] for more details on the routability of Unique-
Local addresses. The Unique-Local prefix is drawn from the
IPv6 Global Unicast Address range but is specified as not
globally routed.
3. Security Considerations
This document does not raise any security issues beyond those
discussed in [RFC 6890].
Bonica, et al. Best Current Practice PAGE 4
RFC 8190 Special-Purpose Address Registries June 2017
4. References
4.1. Normative References
[RFC 6890] Cotton, M., Vegoda, L., Bonica, R., Ed., and B. Haberman,
"Special-Purpose IP Address Registries", BCP 153,
RFC 6890, DOI 10.17487/RFC 6890, April 2013,
<http://www.rfc-editor.org/info/RFC 6890>.
4.2. Informative References
[RFC 919] Mogul, J., "Broadcasting Internet Datagrams", STD 5,
RFC 919, DOI 10.17487/RFC 919, October 1984,
<http://www.rfc-editor.org/info/RFC 919>.
[RFC 1122] Braden, R., Ed., "Requirements for Internet Hosts -
Communication Layers", STD 3, RFC 1122,
DOI 10.17487/RFC 1122, October 1989,
<http://www.rfc-editor.org/info/RFC 1122>.
[RFC 4193] Hinden, R. and B. Haberman, "Unique Local IPv6 Unicast
Addresses", RFC 4193, DOI 10.17487/RFC 4193, October 2005,
<http://www.rfc-editor.org/info/RFC 4193>.
[RFC 4291] Hinden, R. and S. Deering, "IP Version 6 Addressing
Architecture", RFC 4291, DOI 10.17487/RFC 4291, February
2006, <http://www.rfc-editor.org/info/RFC 4291>.
[RFC 4380] Huitema, C., "Teredo: Tunneling IPv6 over UDP through
Network Address Translations (NATs)", RFC 4380,
DOI 10.17487/RFC 4380, February 2006,
<http://www.rfc-editor.org/info/RFC 4380>.
Acknowledgements
Brian Carpenter and C.M. Heard provided useful comments on initial
draft versions of this document. Daniel Migault provided an in-depth
review that helped strengthen the text within the document. Amanda
Baber and Sabrina Tanamal asked questions which resulted in the
authors simplifying the document.
Bonica, et al. Best Current Practice PAGE 5
RFC 8190 Special-Purpose Address Registries June 2017
Authors' Addresses
Ronald Bonica
Juniper Networks
Email: rbonica@juniper.net
Michelle Cotton
PTI, an affiliate of ICANN
12025 Waterfront Drive, Suite 300
Los Angeles, CA 90094-2536
United States of America
Phone: +1-424-254-5300
Email: michelle.cotton@iana.org
Brian Haberman
Johns Hopkins University
Email: brian@innovationslab.net
Leo Vegoda
ICANN
Email: leo.vegoda@icann.org
Bonica, et al. Best Current Practice PAGE 6
RFC TOTAL SIZE: 10158 bytes
PUBLICATION DATE: Tuesday, June 27th, 2017
LEGAL RIGHTS: The IETF Trust (see BCP 78)
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