The Uniform Resource Identifier (URI) DNS Resource Record
RFC 7553

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Internet Engineering Task Force (IETF)                      P. Faltstrom
Request for Comments: 7553                                        Netnod
Category: Informational                                       O. Kolkman
ISSN: 2070-1721                                                     ISOC
                                                               June 2015

       The Uniform Resource Identifier (URI) DNS Resource Record

Abstract

   This document describes the already registered DNS resource record
   (RR) type, called the Uniform Resource Identifier (URI) RR, that is
   used for publishing mappings from hostnames to URIs.

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 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/rfc7553.

Copyright Notice

   Copyright (c) 2015 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.

Faltstrom & Kolkman           Informational                     [Page 1]
RFC 7553                   URI Resource Record                 June 2015

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Applicability Statement . . . . . . . . . . . . . . . . . . .   3
   3.  DNS Considerations  . . . . . . . . . . . . . . . . . . . . .   4
   4.  The Format of the URI RR  . . . . . . . . . . . . . . . . . .   4
     4.1.  Owner Name, Class, and Type . . . . . . . . . . . . . . .   4
     4.2.  Priority  . . . . . . . . . . . . . . . . . . . . . . . .   5
     4.3.  Weight  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     4.4.  Target  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     4.5.  URI RDATA Wire Format . . . . . . . . . . . . . . . . . .   6
   5.  Usages  . . . . . . . . . . . . . . . . . . . . . . . . . . .   6
     5.1.  Example: FTP Server in the example.com Domain . . . . . .   6
     5.2.  Relation to S-NAPTR . . . . . . . . . . . . . . . . . . .   7
     5.3.  Relation to U-NAPTR . . . . . . . . . . . . . . . . . . .   7
     5.4.  Relation to SRV . . . . . . . . . . . . . . . . . . . . .   7
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
     6.1.  Registration of the URI Resource Record Type  . . . . . .   7
     6.2.  Registration of Services  . . . . . . . . . . . . . . . .   8
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   9
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   9
   Appendix A.  The Original RRTYPE Allocation Request . . . . . . .  11
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .  14
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  14

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RFC 7553                   URI Resource Record                 June 2015

1.  Introduction

   This document explains the use of the Domain Name System (DNS) for
   the storage of URIs [RFC3986] and how to resolve hostnames to such
   URIs that can be used by various applications using the URI resource
   record type.  For resolution, the application needs to know both the
   hostname and the protocol that the URI is to be used for.  The
   protocol is registered by IANA.

   Historically, uses of the DNS to map a domain name to a URL have
   relied on the Naming Authority Pointer (NAPTR) RRTYPEs [RFC2915] and
   then on the Dynamic Delegation Discovery System (DDDS) [RFC3401]
   application framework with the DNS as a database as specified in RFC
   3404 [RFC3404].  This has a number of implications such as the fact
   the RRSet returned will contain all URIs "connected" with the owner,
   and not only the ones related to a specific service.