Format for Literal IPv6 Addresses in URL's
RFC 2732

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Network Working Group                                        R. Hinden
Request for Comments: 2732                                       Nokia
Category: Standards Track                                 B. Carpenter
                                                                   IBM
                                                           L. Masinter
                                                                  AT&T
                                                         December 1999

               Format for Literal IPv6 Addresses in URL's

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 (1999).  All Rights Reserved.

Abstract

   This document defines the format for literal IPv6 Addresses in URL's
   for implementation in World Wide Web browsers.  This format has been
   implemented in the IPv6 versions of several widely deployed browsers
   including Microsoft Internet Explorer, Mozilla, and Lynx.  It is also
   intended to be used in the IPv6 version of the service location
   protocol.

   This document incudes an update to the generic syntax for Uniform
   Resource Identifiers defined in RFC 2396 [URL].  It defines a syntax
   for IPv6 addresses and allows the use of "[" and "]" within a URI
   explicitly for this reserved purpose.

1. Introduction

   The textual representation defined for literal IPv6 addresses in
   [ARCH] is not directly compatible with URL's.  Both use ":" and "."
   characters as delimiters.  This document defines the format for
   literal IPv6 Addresses in URL's for implementation in World Wide Web
   browsers.  The goal is to have a format that allows easy "cut" and
   "paste" operations with a minimum of editing of the literal address.

Hinden, et al.              Standards Track                     [Page 1]
RFC 2732            IPv6 Literal Addresses in URL's        December 1999

   The format defined in this document has been implemented in the IPv6
   versions of several widely deployed browsers including Microsoft
   Internet Explorer, Mozilla, and Lynx.  It is also intended to be used
   in the IPv6 version of the service location protocol.

1.1 Requirements

   The keywords MUST, MUST NOT, REQUIRED, SHALL, SHALL NOT, SHOULD,
   SHOULD NOT, RECOMMENDED, MAY, and OPTIONAL, if and where they appear
   in this document, are to be interpreted as described in [KEYWORDS].

   World Wide Web browsers SHOULD implement the format of IPv6 literals
   in URL's defined in this document.  Other types of applications and
   protocols that use URL's MAY use this format.

2. Literal IPv6 Address Format in URL's Syntax

   To use a literal IPv6 address in a URL, the literal address should be
   enclosed in "[" and "]" characters.  For example the following
   literal IPv6 addresses:

      FEDC:BA98:7654:3210:FEDC:BA98:7654:3210
      1080:0:0:0:8:800:200C:4171
      3ffe:2a00:100:7031::1
      1080::8:800:200C:417A
      ::192.9.5.5
      ::FFFF:129.144.52.38
      2010:836B:4179::836B:4179

   would be represented as in the following example URLs:

      http://[FEDC:BA98:7654:3210:FEDC:BA98:7654:3210]:80/index.html
      http://[1080:0:0:0:8:800:200C:417A]/index.html
      http://[3ffe:2a00:100:7031::1]
      http://[1080::8:800:200C:417A]/foo
      http://[::192.9.5.5]/ipng
      http://[::FFFF:129.144.52.38]:80/index.html
      http://[2010:836B:4179::836B:4179]

3. Changes to RFC 2396

   This document updates the generic syntax for Uniform Resource
   Identifiers defined in RFC 2396 [URL].  It defines a syntax for IPv6
   addresses and allows the use of "[" and "]" within a URI explicitly
   for this reserved purpose.

Hinden, et al.              Standards Track                     [Page 2]
RFC 2732            IPv6 Literal Addresses in URL's        December 1999

   The following changes to the syntax in RFC 2396 are made:
   (1) change the 'host' non-terminal to add an IPv6 option:

      host          = hostname | IPv4address | IPv6reference
      ipv6reference = "[" IPv6address "]"

   where IPv6address is defined as in RFC2373 [ARCH].

   (2) Replace the definition of 'IPv4address' with that of RFC 2373, as
   it correctly defines an IPv4address as consisting of at most three
   decimal digits per segment.

   (3) Add "[" and "]" to the set of 'reserved' characters:

      reserved    = ";" | "/" | "?" | ":" | "@" | "&" | "=" | "+" |
                    "$" | "," | "[" | "]"

   and remove them from the 'unwise' set:

      unwise      = "{" | "}" | "|" | "\" | "^" | "`"

4. Security Considerations

   The use of this approach to represent literal IPv6 addresses in URL's