RFC 208 (rfc208) - Page 2 of 3

Address tables

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.











McKenzie