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+Network Working Group                                        A. McKenzie
+Request for Comments: 208                        Bolt Beranek and Newman
+NIC: 7181                                                  9 August 1971
+Categories: B.l, C.2
+Updates: none
+Obsoletes: none
+
+
+                             ADDRESS TABLES
+
+   Attached is a copy of a revision to Appendix 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.
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+McKenzie                                                        [Page 1]
+
+RFC 208                      Address Tables                9 August 1971
+
+
+Report No. 1822                             Bolt Beranek and Newman Inc.
+
+APPENDIX A
+
+IMP 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.
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+McKenzie                                                        [Page 2]
+
+RFC 208                      Address Tables                9 August 1971
+
+
+ IMP       SITE       HOST                      NETWORK     SCHEDULE
+NUMBER     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                158
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+McKenzie                                                        [Page 3]
+