RFC 2915 (rfc2915) - Page 1 of 18

The Naming Authority Pointer (NAPTR) DNS Resource Record

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Network Working Group                                         M. Mealling
Request for Comments: 2915                        Network Solutions, Inc.
Updates: 2168                                                   R. Daniel
Category: Standards Track                                DATAFUSION, Inc.
                                                           September 2000


        The Naming Authority Pointer (NAPTR) DNS Resource Record

Status of this Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2000). All Rights Reserved.

Abstract

   This document describes a Domain Name System (DNS) resource record
   which specifies a regular expression based rewrite rule that, when
   applied to an existing string, will produce a new domain label or
   Uniform Resource Identifier (URI).  Depending on the value of the
   flags field of the resource record, the resulting domain label or URI
   may be used in subsequent queries for the Naming Authority Pointer
   (NAPTR) resource records (to delegate the name lookup) or as the
   output of the entire process for which this system is used (a
   resolution server for URI resolution, a service URI for ENUM style
   e.164 number to URI mapping, etc).

   This allows the DNS to be used to lookup services for a wide variety
   of resource names (including URIs) which are not in domain name
   syntax.  Reasons for doing this range from URN Resource Discovery
   Systems to moving out-of-date services to new domains.

   This document updates the portions of RFC 2168 specifically dealing
   with the definition of the NAPTR records and how other, non-URI
   specific applications, might use NAPTR.









Mealling & Daniel           Standards Track
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