IANA Registry for Special Labels in the DNS
draft-hoffman-dns-special-labels-00

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Network Working Group                                         P. Hoffman
Internet-Draft                                                     ICANN
Intended status: Standards Track                         October 1, 2018
Expires: April 4, 2019

              IANA Registry for Special Labels in the DNS
                  draft-hoffman-dns-special-labels-00

Abstract

   This document defines an new IANA registry for special labels in the
   DNS.  The registry is useful because the labels cause special
   handling in DNS entities such as stub resolvers, recursive resolvers,
   and applications that use DNS, and developers of software for those
   entities should be aware of the many types of special labels in use.

   [[ A GitHub repo for this document is at
   https://github.com/paulehoffman/dns-special-labels ]]

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on April 4, 2019.

Copyright Notice

   Copyright (c) 2018 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

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   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  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Definition of the New IANA Registry . . . . . . . . . . . . .   3
   3.  Existing Special Labels . . . . . . . . . . . . . . . . . . .   3
     3.1.  The Root Label  . . . . . . . . . . . . . . . . . . . . .   3
     3.2.  Underscore Labels . . . . . . . . . . . . . . . . . . . .   3
     3.3.  IDNA  . . . . . . . . . . . . . . . . . . . . . . . . . .   3
     3.4.  Sentinel  . . . . . . . . . . . . . . . . . . . . . . . .   3
     3.5.  MTA-STS . . . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   4
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .   4
     6.2.  Informative References  . . . . . . . . . . . . . . . . .   5
   Appendix A.  Acknowledgements . . . . . . . . . . . . . . . . . .   5
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   5

1.  Introduction

   Some DNS-related RFCs define labels that are treated specially by
   stub resolvers, by recursive resolvers, and by applications.  It
   would be useful for DNS software developers to know what the entire
   set of such special labels are so they can determine if their
   software needs to handle those labels different than other labels.
   This document defines an IANA registry for special labels and lists
   the initial entries for that registry.

   The special labels defined in the various RFCs were developed after
   extensive IETF evaluation of alternative patterns and approaches in
   light of the desired behavior of the associated protocols.  The group
   designing each protocol looked at the many different ways that the
   protocol might be best deployed.

1.1.  Terminology

   In this document, "left-most label" means the label that appears at
   the left of a domain name when it is wire format or presentation
   format, as defined in [I-D.ietf-dnsop-terminology-bis].  In an
   application that uses IDNA [RFC5891] with one or more right-to-left
   labels, the order of the labels might appear different in the
   application.

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2.  Definition of the New IANA Registry

   The creation of the registry is defined in Section 4.
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