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Internet Engineering Task Force (IETF)                        M. AndrewsRequest for Comments: 7793                                           ISCBCP: 163                                                        May 2016Category: Best Current PracticeISSN: 2070-1721Adding 100.64.0.0/10 Prefixes to theIPv4 Locally-Served DNS Zones RegistryAbstractRFC 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 inSection 2 of RFC 5741.   Information about the current status of this document, any errata,   and how to provide feedback on it may be obtained athttp://www.rfc-editor.org/info/rfc7793.Copyright Notice   Copyright (c) 2016 IETF Trust and the persons identified as the   document authors.  All rights reserved.   This document is subject toBCP 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 2016Table of Contents1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .22.  Changes to the IPv4 Locally-Served DNS Zones Registry . . . .22.1.RFC 6598 Zones  . . . . . . . . . . . . . . . . . . . . .23.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .54.  Security Considerations . . . . . . . . . . . . . . . . . . .55.  Normative References  . . . . . . . . . . . . . . . . . . . .5   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .6   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .61.  Introduction   [RFC6598] specifies that "Reverse DNS queries for Shared Address   Space addresses [100.64.0.0/10] MUST NOT be forwarded to the global   DNS infrastructure."  [RFC6303] 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 [RFC6598], to   the "IPv4 Locally-Served DNS Zone Registry" established in [RFC6303].   Unlike the addresses described in [RFC1918], which are not expected   to be seen by other parties, the addresses defined by [RFC6598] 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.ARPAAndrews                   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.ARPAAndrews                   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.ARPAAndrews                   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.ARPA3.  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 [RFC6303] 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 [RFC6303] and [RFC6598].5.  Normative References   [RFC1918]  Rekhter, Y., Moskowitz, B., Karrenberg, D., de Groot, G.,              and E. Lear, "Address Allocation for Private Internets",BCP 5,RFC 1918, DOI 10.17487/RFC1918, February 1996,              <http://www.rfc-editor.org/info/rfc1918>.   [RFC6303]  Andrews, M., "Locally Served DNS Zones",BCP 163,RFC 6303, DOI 10.17487/RFC6303, July 2011,              <http://www.rfc-editor.org/info/rfc6303>.   [RFC6598]  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/RFC6598, April              2012, <http://www.rfc-editor.org/info/rfc6598>.Andrews                   Best Current Practice                 [Page 5]

RFC 7793         IPv4 Locally-Served DNS Zones Additions        May 2016Acknowledgements   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.orgAndrews                   Best Current Practice                 [Page 6]