Special-Use Domain Names Problem Statement
RFC 8244

Document Type RFC - Informational (October 2017; No errata)
Last updated 2017-10-19
Replaces draft-tldr-sutld-ps
Stream IETF
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IESG IESG state RFC 8244 (Informational)
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Send notices to Suzanne Woolf <suzworldwide@gmail.com>
IANA IANA review state Version Changed - Review Needed
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Internet Engineering Task Force (IETF)                          T. Lemon
Request for Comments: 8244                                 Nominum, Inc.
Category: Informational                                         R. Droms
ISSN: 2070-1721
                                                               W. Kumari
                                                                  Google
                                                            October 2017

               Special-Use Domain Names Problem Statement

Abstract

   The policy defined in RFC 6761 for IANA registrations in the
   "Special-Use Domain Names" registry has been shown, through
   experience, to present challenges that were not anticipated when RFC
   6761 was written.  This memo presents a list, intended to be
   comprehensive, of the problems that have since been identified.  In
   addition, it reviews the history of domain names and summarizes
   current IETF publications and some publications from other
   organizations relating to Special-Use Domain Names.

   This document should be considered required reading for IETF
   participants who wish to express an informed opinion on the topic of
   Special-Use Domain Names.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   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).  Not all documents
   approved by the IESG are a candidate for any level of Internet
   Standard; see 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
   https://www.rfc-editor.org/info/rfc8244.

Lemon, et al.                 Informational                     [Page 1]
RFC 8244            Special-Use Domain Names Problem        October 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
   (https://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.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Problems Associated with Special-Use Domain Names . . . . . .   4
   4.  Existing Practice regarding Special-Use Domain Names  . . . .  10
     4.1.  Primary Special-Use Domain Name Documents . . . . . . . .  10
       4.1.1.  IAB Technical Comment on the Unique DNS Root  . . . .  10
       4.1.2.  Special-Use Domain Names  . . . . . . . . . . . . . .  12
       4.1.3.  MoU Concerning the Technical Work of IANA . . . . . .  13
       4.1.4.  Liaison Statement on Technical Use of Domain Names  .  14
       4.1.5.  IAB Statement on the Registration of Special Use
               Names in the ARPA Domain  . . . . . . . . . . . . . .  15
     4.2.  Secondary Documents Relating to the Special-Use Domain
           Name Question . . . . . . . . . . . . . . . . . . . . . .  15
       4.2.1.  Multicast DNS . . . . . . . . . . . . . . . . . . . .  15
       4.2.2.  The '.onion' Special-Use Top-Level Domain Name  . . .  16
       4.2.3.  Locally Served DNS Zones  . . . . . . . . . . . . . .  16
       4.2.4.  Name Collision in the DNS . . . . . . . . . . . . . .  17
       4.2.5.  SSAC Advisory on the Stability of the Domain
               Namespace . . . . . . . . . . . . . . . . . . . . . .  17
       4.2.6.  Discovery of the IPv6 Prefix Used for IPv6 Address
               Synthesis . . . . . . . . . . . . . . . . . . . . . .  17
       4.2.7.  Additional Reserved Top-Level Domains . . . . . . . .  18
   5.  History . . . . . . . . . . . . . . . . . . . . . . . . . . .  18
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  20
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  20
   8.  Informative References  . . . . . . . . . . . . . . . . . . .  20
   Contributors  . . . . . . . . . . . . . . . . . . . . . . . . . .  24
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  25

Lemon, et al.                 Informational                     [Page 2]
RFC 8244            Special-Use Domain Names Problem        October 2017

1.  Introduction

   One of the key services required to use the Internet is name
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