    Network Working Group                        Peggy Karp
    Request for Comments:  #247                  MITRE
    NIC 7688                                     12 October 1971
    Categories:  Policy, Telnet
    Related:  #226, 236, 239, 233, 237
    Obsoletes:  #226

                      Proferred Set of Standard Host Names

       In RFC #226, BBN's TENEX list of Host names was set up as a strawman
       set of standard Host names.  Comments received since then (an RFC
       actually generated comments!!!) have influenced me to propose the
       following general rules for forming Host names.

       The Host names will be 8 characters in length.  The general form is

                         <site>  '-'  <machine>

       <site> will be at most 4 characters, formed as follows:

            (a)  Use the keyword in the site name, if not more than
                 four characters, e.g., NASA Ames, Case Western
                 Reserve.                    ----  ----

            (b)  Use the standard acronym, if not more than four
                 characters, e.g., UCLA, RADC, NBS.

            (c)  If a standard abbreviation exists, use it, e.g., Ill.

            (d)  If none of the above apply, use the first four letters
                 in the site name, e.g., Burr, Mitr, Harv.

            (e)  If none of the above is acceptable to the site, the
                 technical liaison should select the site mnemonic.

       <machine> will be at most 4 characters of the form <mfg. #>
       <designator>.
       Examples of mfg. # are:

                 IBM 360             2 digit model number
                 IBM 370             3 digit model number
                 PDP                 1 - 2 digit model number
                 Burroughs           4 digits
                 CDC                 4 digits
                 etc.

                                                                    [Page 1]

    RFC #247

       <designator> will be used when more than one machine of the same
       type is located at a site (e.g., 2 PDP-10s at MIT, at SRI, and
       at BBN).

       Limiting <machine> to 4 characters does not permit distinctions
       to be made between machines with 4 digit mfg.  #s.  I expect
       the situation will be handled in an ad hoc manner by the NIC if
       it arises.

       TIPs are identified as 'TIP' rather than by '316'.  If a Host
       is not to be permanently addressable, the machine is identified
       as 'TEST'.

       A list of Host names, formed according to these rules, is
       attached.  Alternate Host names should be provided, as
       suggested by Jon Postel (RFC #236).  RFC's 206, 233, and
       236 present lists with 4-character alternate names.  The
       Technical Liaison should select the alternate name for his
       site and communicate the selection to the NIC.

       The preceding rules and the attached list of Host names are
       subject to the approval of the NWG.  Hereafter, the list will
       be generated and maintained by the NIC in cooperation with
       the Technical Liaison at each site, as suggested in RFC #237.
       Comments should be addressed to Dick Watson.

             [ This RFC was put into machine readable form for entry ]

             [ into the online RFC archives by BBN Corp. under the   ]

             [ direction of Alex McKenzie.                   12/96   ]

                                                                    [Page 2]

    RFC #247
    Attachment 1

              NETWORK ADDRESS                 STANDARD NAME
              ---------------                 -------------
                       1                      UCLA-7
                      65                      UCLA-91
                       2                      SRI-10NI
                      66                      SRI-10AI
                       3                      UCSB-75
                       4                      UTAH-10
                       5                      BBN-516
                      69                      BBN-10A
                     133                      BBN-10B
                       6                      MIT-645
                      70                      MIT-10DM
                     134                      MIT-10AI
                       7                      RAND-65
                      71                      RAND-10
                       8                      SDC-75
                       9                      HARV-10
                      73                      HARV-1
                     137                      HARV-11
                      10                      LL-67
                      74                      LL-TX2
                     138                      LL-TSP
                      11                      SAIL-10
                      12                      ILL-11
                      76                      ILL-6500
                      13                      CASE-10
                      14                      CMU-10
                      15                      BURR-6500
                      79                      BURR-TEST
                      16                      AMES-67
                     144                      AMES-TIP
                     145                      MITR-TIP
                      18                      RADC-645
                     146                      RADC-TIP
                      19                      NBS-11
                     147                      NBS-TIP
                     148                      ETAC-TIP
                      21                      TINK-418
                      22                      MCCL-418
                      23                      USC-44
                     151                      USC-TIP
                     152                      GWC-TIP
                      25                      NCAR-7600
                     153                      NCAR-TIP
                     158                      BBNX-TEST

                                                                    [Page 3]

    RFC #247
    Attachment 2

                      An Implementation Scheme

    If the standard Host names are formed according to the proposed
    rules, the following implementation scheme, suggested by Steve
    Crocker, can be used.

            Map <site> into an 8-bit number, S and
            map <machine> into an 8-bit number, M,
            where
                      S + M = Network Address.

            S and M can be selected such that specification of <site>
            alone could cause a default to the "primary" Host at
            the site.  Note that this scheme depends on a unique
            <site> designator for each IMP.

    Some examples:

    If the "primary" Host at UCLA is the 91, let
            UCLA  -> S = X'41'
               7  -> M = X'40'
              91  -> M = X'00'
    then for
            UCLA-7, S + M = X'01' = 1 base 10
            UCLA-91,S + M = X'41' = 65 base 10

    and
            UCLA alone = X'41' = 65 base 10

    If the primary Host at BBN is TENEX System A, let
            BBN  ->  S = X'45'
            516  ->  M = X'40'
            10A  ->  M = X'00'
            10B  ->  M = X'C0'
    then for
            BBN-516, S + M = X'05' = 5 base 10
            BBN-10A, S + M = X'45' = 69 base 10
            BBN-10B, S + M = X'85' = 133 base 10

    and
            BBN alone = X'45' = 69 base 10

    The primary Host for each IMP would be designated by the
    site and such information disseminated by the NIC.

                                                                    [Page 4]