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Network Working Group                                        A. McKenzieRequest for Comments: 208                        Bolt Beranek and NewmanNIC: 7181                                                  9 August 1971Categories: B.l, C.2Updates: noneObsoletes: noneADDRESS TABLES   Attached is a copy of a revision toAppendix A of BBN Report No.   1822; the revised version of the Appendix is our first attempt to   make the list of sites attached to the ARPA Network prospective   rather than retrospective.  We are adopting this approach because of   the large number of sites scheduled for attachment in the near   future, and because many Hosts apparently require a site's address to   be in some local table before their NCPs will permit communication   with the site.  Therefore, we urge such Hosts to add the new sites to   their lists of addresses as soon as possible.  Also, please note the   address change which will be made at BBN on exactly September first.   Incidentally, it seems to us that it is irrational for an NCP to   discard otherwise valid messages, simply because the sender's address   doesn't appear in a local table.  Similarly, it seems almost as   irrational for an NCP to prevent a local user from trying to   communicate with a remote site, the address of which is known to the   user but not stored in the NCP's tables.McKenzie                                                        [Page 1]

RFC 208                      Address Tables                9 August 1971Report No. 1822                             Bolt Beranek and Newman Inc.APPENDIX AIMP AND HOST SITE IDENTIFICATION   Bit 9-16 of the leader of most Host-to-IMP or IMP-to-Host messages   define a network address related to the message (these bits are not   meaningful for message types 1, 2, and 4).  In a Host-to-IMP message   the network address identifies a particular Host to which the message   should be delivered.  In an IMP-to-Host message the network address   identifies the Host from which the message originated.   A network address consists of six bits (bits 11-16 of the leader)   which specify an IMP number, preceded by two bits (bits 9-10 of the   leader) which specify the Host number of a particular Host connected   to that IMP.  The table below gives the decimal values of IMP number,   Host number, and network address for each Host currently connected to   the ARPA Network or scheduled for connection in the near future.   Scheduled installation dates are also shown for Hosts not currently   connected; these dates, however, are subject to change without   notice.    IMP      SITE     HOST                    NETWORK    SCHEDULED   NUMBER    NAME    NUMBER       HOST        ADDRESS   INSTALLATION   ------    ----    ------       ----        -------   ------------     1       UCLA      0       SIGMA-7           1                       1       IBM 360/91       65     2       SRI       0       PDP-10 (NIC)      2                       1       PDP-10 (Al)      66     3       UCSB      0       IBM 360/75        3     4       UTAH      0       PDP-lO            4     5       BBN       0       DDP-516           5  )   See Note 1                       1       PDP-10 (A)       69  )                       2       PDP-1O (B)      133   Note 1: Prior to September 1, 1971 the BBN PDP-1O (A) will be Host   number 0 (network address 5) and the BBN DDP-516 will be Host number   1 (network address 69).  The address change is to be made during the   day on 9/1/71.McKenzie                                                        [Page 2]

RFC 208                      Address Tables                9 August 1971 IMP       SITE       HOST                      NETWORK     SCHEDULENUMBER     NAME      NUMBER      HOST           ADDRESS   INSTALLATION------     ----      ------      ----           -------   ------------  6        MIT          0       Honeywell 645        6                        1       PDP-10              70  7        RAND         O       360/65               7                        1       PDP-1O              71  8        SDC          O       IBM 360/75           8  9        HARVARD      O       PDP-1O               9                        1       PDP-1               73                        2       PDP-11             137 10        LINCOLN      O       IBM 360/67          10                        1       TX2                 74 11        STANFORD     O       PDP-1O              11 12        ILLINOIS     O       PDP-11              12 13        CASE         O       PDP-1O              13 14        CARNEGIE     O       PDP-1O              14 15        PAOLI        O       B6500               15 16        NASA/AMES    O       IBM 360/67          16      8/3/71                        2       TIP                144 17        MITRE        2       TIP                145      8/31/71 18        RADC         O       H 635/645           18      10/5/71                        2       TIP                146 19        NBS          O       PDP-11              19      11/2/71 20        ETAC         2       TIP                148      11/30/71 21        TINKER       O       418 III             21      1/4/71 22        McCLELLAN    O       418 III             22      2/1/72 23        USC          0       IBM 360/44          23      2/29/72                        2       TIP                151 24        GWC          2       TIP                152      3/14/72 25        NCAR         O       CDC 7600            25      3/28/72                        2       TIP                153 30        BBN/TIP      2       TIP                158McKenzie                                                        [Page 3]