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The Naming Authority Pointer (NAPTR) DNS Resource Record (RFC2915)

IP.com Disclosure Number: IPCOM000005097D
Original Publication Date: 2000-Sep-01
Included in the Prior Art Database: 2001-Aug-15
Document File: 19 page(s) / 42K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

M. Mealling: AUTHOR [+2]

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 text was extracted from a ASCII document.
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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 [Page 1]

RFC 2915 NAPTR DNS RR September 2000

Table of Contents

1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 2. NAPTR RR Format . . . . . . . . . . . . . . . . . . . . . . 3 3. Substitution Expression Grammar . . . . . . . . . . . . . . 7 4. The Basic NAPTR Algorithm . . . . . . . . . . . . . . . . . 8 5. Concerning How NAPTR Uses SRV Records . . . . . . . . . . . 9 6. Application Specifications . . . . . . . . . . . . . . . . . 10 7. Examples . . . . . . . . . . . . . . . . . . . . . . . . . . 10 7.1 Example 1 . . . . . . . . . . . . . . . . . . . . . . . . . 10 7.2 Example 2 . . . . . . . . . . . . . . . . . . . . . . . . . 12 7.3 Example 3 . . . . . . . . . . . . . . . . . . . . . . . . . 13 8. DNS Packet Format . . . . . . . . . . . . . . . . . . . . . 13 9. Master File Format . . . . . . . . . . . . . . . . . . . . . 14 10. Advice for DNS Administrators . . . . . . . . . . . . . . . 14 11. Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 12. IANA Considerations . . . . . . . . . . . . . . . . . . . . 15 13. Security Considerations . . . . . . . . . . . . . . . ....