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Internationalizing Domain Names in Applications (IDNA) (RFC3490)

IP.com Disclosure Number: IPCOM000011593D
Original Publication Date: 2003-Mar-01
Included in the Prior Art Database: 2003-Mar-07
Document File: 23 page(s) / 52K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

P. Faltstrom: AUTHOR [+3]

Abstract

Until now, there has been no standard method for domain names to use characters outside the ASCII repertoire. This document defines internationalized domain names (IDNs) and a mechanism called Internationalizing Domain Names in Applications (IDNA) for handling them in a standard fashion. IDNs use characters drawn from a large repertoire (Unicode), but IDNA allows the non-ASCII characters to be represented using only the ASCII characters already allowed in so- called host names today. This backward-compatible representation is required in existing protocols like DNS, so that IDNs can be introduced with no changes to the existing infrastructure. IDNA is only meant for processing domain names, not free text.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 5% of the total text.

Network Working Group                                       P. Faltstrom

Request for Comments: 3490                                         Cisco

Category: Standards Track                                     P. Hoffman

                                                              IMC & VPNC

                                                             A. Costello

                                                             UC Berkeley

                                                              March 2003

         Internationalizing Domain Names in Applications (IDNA)

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 (2003).  All Rights Reserved.

Abstract

   Until now, there has been no standard method for domain names to use

   characters outside the ASCII repertoire.  This document defines

   internationalized domain names (IDNs) and a mechanism called

   Internationalizing Domain Names in Applications (IDNA) for handling

   them in a standard fashion.  IDNs use characters drawn from a large

   repertoire (Unicode), but IDNA allows the non-ASCII characters to be

   represented using only the ASCII characters already allowed in so-

   called host names today.  This backward-compatible representation is

   required in existing protocols like DNS, so that IDNs can be

   introduced with no changes to the existing infrastructure.  IDNA is

   only meant for processing domain names, not free text.

Table of Contents

   1. Introduction..................................................  2

      1.1 Problem Statement.........................................  3

      1.2 Limitations of IDNA.......................................  3

      1.3 Brief overview for application developers.................  4

   2. Terminology...................................................  5

   3. Requirements and applicability................................  7

      3.1 Requirements..............................................  7

      3.2 Applicability.............................................  8

         3.2.1. DNS resource records................................  8

Faltstrom, et al.           Standards Track                     [Page 1]

RFC 3490           ®..