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IETF RFC 7793
Last modified on Friday, May 13th, 2016
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Internet Engineering Task Force (IETF) M. Andrews
Request for Comments: 7793 ISC
BCP: 163 May 2016
Category: Best Current Practice
ISSN: 2070-1721
Adding 100.64.0.0/10 Prefixes to the
IPv4 Locally-Served DNS Zones Registry
 Abstract
RFC 6598 specifies that "Reverse DNS queries for Shared Address Space
addresses [100.64.0.0/10] MUST NOT be forwarded to the global DNS
infrastructure."
This document formally directs IANA to add the associated zones to
the "IPv4 Locally-Served DNS Zones Registry" to prevent such queries
from accidentally leaking to the global DNS infrastructure.
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 5741.
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 7793.
Copyright Notice
Copyright (c) 2016 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.
Andrews Best Current Practice PAGE 1 
RFC 7793 IPv4 Locally-Served DNS Zones Additions May 2016
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Changes to the IPv4 Locally-Served DNS Zones Registry . . . . 2
2.1. RFC 6598 Zones . . . . . . . . . . . . . . . . . . . . . 2
3. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 5
4. Security Considerations . . . . . . . . . . . . . . . . . . . 5
5. Normative References . . . . . . . . . . . . . . . . . . . . 5
Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 6
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 6
1. Introduction
[RFC 6598] specifies that "Reverse DNS queries for Shared Address
Space addresses [100.64.0.0/10] MUST NOT be forwarded to the global
DNS infrastructure." [RFC 6303] provides guidance on handling such
queries.
This document directs the IANA to add the IPv4 reverse zones
corresponding to 100.64.0.0/10, a netblock reserved in [RFC 6598], to
the "IPv4 Locally-Served DNS Zone Registry" established in [RFC 6303].
Unlike the addresses described in [RFC 1918], which are not expected
to be seen by other parties, the addresses defined by [RFC 6598] are
expected to be seen by parties other than those deploying the
addresses. Therefore, it is more crucial that recursive nameservers
default to serving these zones locally.
2. Changes to the IPv4 Locally-Served DNS Zones Registry
IANA has added the zones listed in "RFC 6598 Zones" (Section 2.1) to
the "IPv4 Locally-Served DNS Zone Registry".
2.1. RFC 6598 Zones
64.100.IN-ADDR.ARPA
65.100.IN-ADDR.ARPA
66.100.IN-ADDR.ARPA
67.100.IN-ADDR.ARPA
68.100.IN-ADDR.ARPA
69.100.IN-ADDR.ARPA
70.100.IN-ADDR.ARPA
Andrews Best Current Practice PAGE 2
RFC 7793 IPv4 Locally-Served DNS Zones Additions May 2016
71.100.IN-ADDR.ARPA
72.100.IN-ADDR.ARPA
73.100.IN-ADDR.ARPA
74.100.IN-ADDR.ARPA
75.100.IN-ADDR.ARPA
76.100.IN-ADDR.ARPA
77.100.IN-ADDR.ARPA
78.100.IN-ADDR.ARPA
79.100.IN-ADDR.ARPA
80.100.IN-ADDR.ARPA
81.100.IN-ADDR.ARPA
82.100.IN-ADDR.ARPA
83.100.IN-ADDR.ARPA
84.100.IN-ADDR.ARPA
85.100.IN-ADDR.ARPA
86.100.IN-ADDR.ARPA
87.100.IN-ADDR.ARPA
88.100.IN-ADDR.ARPA
89.100.IN-ADDR.ARPA
90.100.IN-ADDR.ARPA
91.100.IN-ADDR.ARPA
92.100.IN-ADDR.ARPA
93.100.IN-ADDR.ARPA
94.100.IN-ADDR.ARPA
Andrews Best Current Practice PAGE 3
RFC 7793 IPv4 Locally-Served DNS Zones Additions May 2016
95.100.IN-ADDR.ARPA
96.100.IN-ADDR.ARPA
97.100.IN-ADDR.ARPA
98.100.IN-ADDR.ARPA
99.100.IN-ADDR.ARPA
100.100.IN-ADDR.ARPA
101.100.IN-ADDR.ARPA
102.100.IN-ADDR.ARPA
103.100.IN-ADDR.ARPA
104.100.IN-ADDR.ARPA
105.100.IN-ADDR.ARPA
106.100.IN-ADDR.ARPA
107.100.IN-ADDR.ARPA
108.100.IN-ADDR.ARPA
109.100.IN-ADDR.ARPA
110.100.IN-ADDR.ARPA
111.100.IN-ADDR.ARPA
112.100.IN-ADDR.ARPA
113.100.IN-ADDR.ARPA
114.100.IN-ADDR.ARPA
115.100.IN-ADDR.ARPA
116.100.IN-ADDR.ARPA
117.100.IN-ADDR.ARPA
118.100.IN-ADDR.ARPA
Andrews Best Current Practice PAGE 4
RFC 7793 IPv4 Locally-Served DNS Zones Additions May 2016
119.100.IN-ADDR.ARPA
120.100.IN-ADDR.ARPA
121.100.IN-ADDR.ARPA
122.100.IN-ADDR.ARPA
123.100.IN-ADDR.ARPA
124.100.IN-ADDR.ARPA
125.100.IN-ADDR.ARPA
126.100.IN-ADDR.ARPA
127.100.IN-ADDR.ARPA
3. IANA Considerations
Per this document, IANA has added the zones listed in "RFC 6598
Zones" (Section 2.1) to the "IPv4 Locally-Served DNS Zone Registry".
IANA is reminded that an insecure delegation for these zones is
required for compliance with [RFC 6303] to break the DNSSEC chain of
trust.
4. Security Considerations
This document does not present additional security risks to the
Internet than those described in [RFC 6303] and [RFC 6598].
5. Normative References
[RFC 1918] Rekhter, Y., Moskowitz, B., Karrenberg, D., de Groot, G.,
and E. Lear, "Address Allocation for Private Internets",
BCP 5, RFC 1918, DOI 10.17487/RFC 1918, February 1996,
<http://www.rfc-editor.org/info/RFC 1918>.
[RFC 6303] Andrews, M., "Locally Served DNS Zones", BCP 163,
RFC 6303, DOI 10.17487/RFC 6303, July 2011,
<http://www.rfc-editor.org/info/RFC 6303>.
[RFC 6598] Weil, J., Kuarsingh, V., Donley, C., Liljenstolpe, C., and
M. Azinger, "IANA-Reserved IPv4 Prefix for Shared Address
Space", BCP 153, RFC 6598, DOI 10.17487/RFC 6598, April
2012, <http://www.rfc-editor.org/info/RFC 6598>.
Andrews Best Current Practice PAGE 5
RFC 7793 IPv4 Locally-Served DNS Zones Additions May 2016
Acknowledgements
The author would like to thank Joe Abley for his review comments.
Author's Address
M. Andrews
Internet Systems Consortium
950 Charter Street
Redwood City, CA 94063
United States
Email: marka@isc.org
Andrews Best Current Practice PAGE 6
RFC TOTAL SIZE: 7713 bytes
PUBLICATION DATE: Friday, May 13th, 2016
LEGAL RIGHTS: The IETF Trust (see BCP 78)
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