RFC 3491 (rfc3491) - Page 1 of 7

Nameprep: A Stringprep Profile for Internationalized Domain Names (IDN)

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Network Working Group                                         P. Hoffman
Request for Comments: 3491                                    IMC & VPNC
Category: Standards Track                                    M. Blanchet
                                                              March 2003

                   Nameprep: A Stringprep Profile for
                  Internationalized Domain Names (IDN)

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.


   This document describes how to prepare internationalized domain name
   (IDN) labels in order to increase the likelihood that name input and
   name comparison work in ways that make sense for typical users
   throughout the world.  This profile of the stringprep protocol is
   used as part of a suite of on-the-wire protocols for
   internationalizing the Domain Name System (DNS).

1. Introduction

   This document specifies processing rules that will allow users to
   enter internationalized domain names (IDNs) into applications and
   have the highest chance of getting the content of the strings
   correct.  It is a profile of stringprep [STRINGPREP].  These
   processing rules are only intended for internationalized domain
   names, not for arbitrary text.

   This profile defines the following, as required by [STRINGPREP].

   -  The intended applicability of the profile: internationalized
      domain names processed by IDNA.

   -  The character repertoire that is the input and output to
      stringprep:  Unicode 3.2, specified in section 2.

Hoffman & Blanchet          Standards Track

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