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Versions: 00 01 02 03 04 05 06 07 08 09 10 11 12 13 RFC 2606

INTERNET-DRAFT                                     Test and Example TLDs
                                                         October 29 1997
                                                   Expires April 28 1998




                Test and Example Top Level Domain Names
                ---- --- ------- --- ----- ------ -----

                         Donald E. Eastlake 3rd
                            Aliza R. Panitz




                        Status of This Document

       This draft, file name draft-ietf-dnsind-test-tlds-04.txt, is
   intended to be become a Best Current Practice RFC.  Distribution of
   this document is unlimited. Comments should be sent to the DNS
   mailing list <namedroppers@internic.net> or to the authors.

   This document is an Internet-Draft.  Internet-Drafts are working
   documents of the Internet Engineering Task Force (IETF), its areas,
   and its working groups.  Note that other groups may also distribute
   working documents as Internet-Drafts.

   Internet-Drafts are draft documents valid for a maximum of six
   months.  Internet-Drafts may be updated, replaced, or obsoleted by
   other documents at any time.  It is not appropriate to use Internet-
   Drafts as reference material or to cite them other than as a
   ``working draft'' or ``work in progress.''

   To learn the current status of any Internet-Draft, please check the
   1id-abstracts.txt listing contained in the Internet-Drafts Shadow
   Directories on ds.internic.net (East USA), ftp.isi.edu (West USA),
   nic.nordu.net (North Europe), ftp.nis.garr.it (South Europe),
   munnari.oz.au (Pacific Rim), or ftp.is.co.za (Africa).



Abstract

   To reduce the likelihood of conflict and confusion, a number of top
   level domain names are reserved for use in private testing, as
   examples in documentation, and the like.








D. Eastlake, A. Panitz                                          [Page 1]

INTERNET-DRAFT                                     Test and Example TLDs


Table of Contents

      Status of This Document....................................1
      Abstract...................................................1

      Table of Contents..........................................2

      1. Introduction............................................3
      2. TLDs for Testing and Documentation Examples.............3
      3. Security Considerations.................................4

      References.................................................5
      Author's Addresses.........................................5
      Expiration and File Name...................................5






































D. Eastlake, A. Panitz                                          [Page 2]

INTERNET-DRAFT                                     Test and Example TLDs


1. Introduction

   The global Internet Domain Name System is documented in RFC 1034,
   1035, 1591 and numerous additional Requests for Comment.  It defines
   a tree of names starting with root, ".", immediately below which are
   top level domain names such as .com and .us. Below top level domain
   names there are normally additional levels of names.



2. TLDs for Testing and Documentation Examples

   There is a need for top level domain names that can safely be used in
   private testing, as examples in documentation, and for
   experimentation, without fear of conflicts with actual top level
   domain names in the global DNS, or which should be reserved to avoid
   confusion.  The creation and assignment of new top level domain names
   is becoming an increasingly prominent decision as the domain name
   system assumes increasing importance in the world.  For this reason,
   it is best to allocate a reasonably large number of names of
   different lengths now to reduce the probability of a need for further
   top level domain name creation and assignment for this purpose in the
   foreseeable future.

   To satisfy these needs, forty one domain names are reserved as
   described below.

   The following eleven top level domain names are permanently reserved.

                     .xy
                     .xz
                    .nil
                    .tld
                   .link
                   .site
                   .test
                .example
                .invalid
              .localhost
    .asixtythreecharacterstopleveldomainnamewhichisthelongestallowed

        Note: two letter top level domain names are reserved for ISO
        3166 / Universal Postal Union two letter country codes.
        However, ISO 3166 reserves all two letter codes beginning with
        "x" for local use and states that they will never be assigned to
        a country.

   These names are available for use in testing or as examples in
   documentation except for .invalid, .link, and .localhost.  .invalid
   is intended for use in online construction of domain names that are


D. Eastlake, A. Panitz                                          [Page 3]

INTERNET-DRAFT                                     Test and Example TLDs


   sure to be invalid.  .link is reserved to avoid confusion with the
   link.local domain provided in draft-ietf-dnsind-local-names-*.txt and
   should not be used.  The .localhost TLD is traditionally staticly
   defined in host DNS implementations as having an A record pointing to
   the loop back IP address and is reserved for that purpose and is
   reserved for this use.

   The above eleven names will be added to the root with a single type
   TXT RR under each. The RDATA for these TXT RRs will contain the
   single string

        Reserved, see RFC NNNN.

   [where NNNN is the number of the RFC this draft gets issued as.]

   In addition, the thirty domain names formed by appending the digits 0
   through 9 to "tld", "test", and "example, as listed below, are also
   permanently reserved for test and documentation use; however, since
   there are currently no TLDs with digits in them and the presence of
   these names without the digit suffix should provide notice, it is not
   intended that these thirty additional TLDs be entered into the root
   zone.

              .tld0        .test0        .example0
              .tld1        .test1        .exmaple1
              .tld2        .test2        .example2
              .tld3        .test2        .example2
              .tld4        .test4        .example4
              .tld5        .test5        .exmaple5
              .tld6        .test6        .example6
              .tld7        .test7        .example7
              .tld8        .test8        .example8
              .tld9        .test9        .example9



3. Security Considerations

   Confusion and conflict can be caused by the use of a current or
   potential future top level domain name in testing, experimentation,
   as an example in documentation, or the like.  Test and experimental
   software can escape and end up being run against the global
   operational DNS.  Even examples used "only" in documentation can end
   up being coded and released or cause conflicts due to later real use
   and the possible acquisition of intellectual property rights in such
   "example" names.

   The reservation of several top level domain names for these purposes
   will minimize such confusion and conflict.



D. Eastlake, A. Panitz                                          [Page 4]

INTERNET-DRAFT                                     Test and Example TLDs


References

   RFC 1034 - P. Mockapetris, "Domain names - concepts and facilities",
   11/01/1987.

   RFC 1035 - P. Mockapetris, "Domain names - implementation and
   specification", 11/01/1987.

   RFC 1591 - J. Postel, "Domain Name System Structure and Delegation",
   03/03/1994.

   draft-ietf-dnsind-local-names-*.txt



Author's Addresses

   Donald E. Eastlake 3rd
   CyberCash, Inc.
   318 Acton Street
   Carlisle, MA 01741 USA

   Telephone:   +1 978 287 4877
                +1 703 620-4200 (main office, Reston, VA)
   FAX:         +1 978 371 7148
   EMail:       dee@cybercash.com


   Aliza R. Panitz
   AccessAbility Internet Services, Inc.
   12515 Greenbriar Road
   Potomac, MD 20854 USA

   Telephone: +1 301 983-3547
   FAX:       +1 301 983-4899
   EMail:       buglady@ability.net



Expiration and File Name

   This draft expires April 28 1998.

   Its file name is draft-ietf-dnsind-test-tlds-04.txt.








D. Eastlake, A. Panitz                                          [Page 5]


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