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RFC 0247

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]



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