RFC 921 (rfc921) - Page 1 of 13

Domain name system implementation schedule - revised

Network Working Group                                         Jon Postel
Request for Comments: 921                                            ISI
                                                            October 1984
Updates:  RFC 897, RFC 881

          Domain Name System Implementation Schedule - Revised


Status of this Memo

   This memo is a policy statement on the implementation of the Domain
   Style Naming System in the Internet.  This memo is an update of
   RFC-881, and RFC-897.  This is an official policy statement of the
   IAB and the DARPA.  Distribution of this memo is unlimited.

   The intent of this memo is to detail the schedule for the
   implementation for the Domain Style Naming System.  The explanation
   of how this system works is to be found in the references.

The Current Situation

   There are three aspects to the domain style naming system, (1) the
   names themselves, (2) the method of translating names to addresses,
   and (3) the relationship between the Internet and the rest of the
   world.

   Names

      The names are being changed from simple names, or globally unique
      strings, to structured names, where each component name is unique
      only with respect to the superior component name.

      Simple Names

         Until recently, hosts in the DARPA research and DDN operational
         communities were assigned names in a flat or global name space
         of character strings.  There are some limits on these names.
         They must start with a letter, end with a letter or digit and
         have only letters or digits or hyphen as interior characters.
         Case is not significant.

            For example:  USC-ISIF

      Hierarchical Names

         Because of the growth of the Internet, structured names (or
         domain style names) have been introduced.  Each element of the
         structured name will be a character string (with the same
         constraints that previously applied to the simple names).  The




Postel