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+Network Working Group                                          J. Postel
+Request for Comments:  796                                           ISI
+Replaces: IEN 115                                         September 1981
+                            ADDRESS MAPPINGS
+                            ----------------
+
+
+Internet Addresses
+------------------
+
+   This memo describes the relationship between address fields used in
+   the Internet Protocol (IP) [1] and several specific networks.
+
+   An internet address is a 32 bit quantity, with several codings as
+   shown below.
+
+   The first type (or class a) of address has a 7-bit network number and
+   a 24-bit local address.
+
+                           1                   2                   3    
+       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 
+      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+      |0|   NETWORK   |                Local Address                  |
+      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+                             Class A Address
+
+   The second type (or class b) of address has a 14-bit network number
+   and a 16-bit local address.
+
+                           1                   2                   3   
+       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 
+      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+      |1 0|           NETWORK         |          Local Address        |
+      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+                             Class B Address
+
+   The third type (or class c) of address has a 21-bit network number
+   and a 8-bit local address.
+
+                           1                   2                   3   
+       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 
+      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+      |1 1 0|                    NETWORK              | Local Address |
+      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+                             Class C Address
+
+   The local address carries information to address a host in the
+   network identified by the network number.  Since each network has a
+
+
+
+Postel                                                          [Page 1]
+
+
+                                                          September 1981
+RFC 796                                                 Address Mappings
+
+
+
+   particular address format and length, the following section describes
+   the mapping between internet local addresses and the actual address
+   format used in the particular network.
+
+Internet to Local Net Address Mappings
+--------------------------------------
+
+   The following transformations are used to convert internet addresses
+   to local net addresses and vice versa:
+
+      AUTODIN II
+      ----------
+
+         The AUTODIN II has 16 bit subscriber addresses which identify
+         either a host or a terminal.  These addresses may be assigned
+         independent of location.  The 16 bit AUTODIN II address is
+         located in the 24 bit internet local address as shown below.
+
+         The network number of the AUTODIN II is 26 (Class A).
+
+         +----------------+
+         |  HOST/TERMINAL |   AUTODIN II
+         +----------------+
+                 16
+
+         +--------+--------+--------+--------+
+         |   26   |  ZERO  |  HOST/TERMINAL  |   IP
+         +--------+--------+--------+--------+
+              8        8           16
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+Postel                                                          [Page 2]
+
+
+                                                          September 1981
+RFC 796                                                 Address Mappings
+
+
+
+      ARPANET
+      -------
+
+         The ARPANET (with 96 bit leaders) has 24 bit addresses.  The 24
+         bits are assigned to host, logical host, and IMP leader fields
+         as illustrated below.  These 24 bit addresses are used directly
+         for the 24 bit local address of the internet address.  However,
+         the ARPANET IMPs do not yet support this form of logical
+         addressing so the logical host field is set to zero in the
+         leader.
+
+         The network number of the ARPANET is 10 (Class A).
+
+         +--------+--------+--------+
+         |  HOST  |  ZERO  |  IMP   |   ARPANET
+         +--------+--------+--------+
+              8        8        8
+
+         +--------+--------+--------+--------+
+         |   10   |  HOST  |   LH   |  IMP   |   IP
+         +--------+--------+--------+--------+
+              8        8        8        8
+
+      DCNs
+      ----
+
+         The Distributed Computing Networks (DCNs) at COMSAT and UCL use
+         16 bit addresses divided into an 8 bit host identifier (HID),
+         and an 8 bit process identifier (PID).  The format locates
+         these 16 bits in the low order 16 bits of the 24 bit internet
+         address, as shown below.
+
+         The network number of the COMSAT-DCN is 29 (Class A), and of
+         the UCL-DCN is 30 (Class A).
+
+         +--------+--------+
+         |   HID  |   PID  |   DCN
+         +--------+--------+
+              8        8
+
+         +--------+--------+--------+--------+
+         |   18   |  ZERO  |   HID  |   PID  |   IP
+         +--------+--------+--------+--------+
+              8        8        8        8
+
+
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+
+
+Postel                                                          [Page 3]
+
+
+                                                          September 1981
+RFC 796                                                 Address Mappings
+
+
+
+      EDN
+      ---
+
+         The Experimental Data Network at the Defense Communication
+         Engineering Center (DCEC) uses the same type of addresses as
+         the ARPANET (with 96 bit leaders) and has 24 bit addresses.
+         The 24 bits are assigned to host, logical host, and IMP leader
+         fields as illustrated below.  These 24 bit addresses are used
+         directly for the 24 bit local address of the internet address.
+         However, the IMPs do not yet support this form of logical
+         addressing so the logical host field is set to zero in the
+         leader.
+
+         The network number of the EDN is 21 (Class A).
+
+         +--------+--------+--------+
+         |  HOST  |  ZERO  |  IMP   |   EDN
+         +--------+--------+--------+
+              8        8        8
+
+         +--------+--------+--------+--------+
+         |   21   |  HOST  |   LH   |  IMP   |   IP
+         +--------+--------+--------+--------+
+              8        8        8        8
+
+      LCSNET
+      ------
+
+         The LCS NET at MIT's Laboratory for Computer Science uses 32
+         bit addresses of several formats.  Please see [3] for more
+         details.  The most common format locates the low order 24 bits
+         of the 32 bit LCS NET address in the 24 bit internet local
+         address, as shown below.
+
+         The network number of the LCS NET is 18 (Class A).
+
+         +--------+--------+--------+
+         | SUBNET |RESERVED|  HOST  |   LCSNET
+         +--------+--------+--------+
+              8        8        8
+
+         +--------+--------+--------+--------+
+         |   18   | SUBNET |RESERVED|  HOST  |   IP
+         +--------+--------+--------+--------+
+              8        8        8        8
+
+
+
+
+
+Postel                                                          [Page 4]
+
+
+                                                          September 1981
+RFC 796                                                 Address Mappings
+
+
+
+      PRNET
+      -----
+
+         The Packet Radio networks use 16 bit addresses.  These are
+         independent of location (indeed the hosts may be mobile).  The
+         16 bit PRNET addresses are located in the 24 bit internet local
+         address as shown below.
+
+         The network numbers of the PRNETs are:
+
+            BBN-PR      1 (Class A)
+            SF-PR-1     2 (Class A)
+            SILL-PR     5 (Class A)
+            SF-PR-2     6 (Class A)
+            BRAGG-PR    9 (Class A)
+            DC-PR      20 (Class A)
+
+         +--------+--------+
+         |       HOST      |   PRNET
+         +--------+--------+
+                 16
+
+         +--------+--------+--------+--------+
+         |   net  |  ZERO  |       HOST      |   IP
+         +--------+--------+--------+--------+
+              8        8           16
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+Postel                                                          [Page 5]
+
+
+                                                          September 1981
+RFC 796                                                 Address Mappings
+
+
+
+      SATNET
+      ------
+
+         The Atlantic Satellite Packet Network has 16 bit addresses for
+         hosts.  These addresses may be assigned independent of location
+         (i.e., ground station).  It is also possible to assign several
+         addresses to one physical host, so the addresses are logical
+         addresses.  The 16 bit SATNET address is located in the 24 bit
+         internet local address as shown below.
+
+         The network number of the SATNET is 4 (Class A).
+
+         +--------+--------+
+         |       HOST      |   SATNET
+         +--------+--------+
+                 16
+
+         +--------+--------+--------+--------+
+         |    4   |  ZERO  |       HOST      |   IP
+         +--------+--------+--------+--------+
+              8        8           16
+
+      WBCNET
+      ------
+
+         The Wideband Communication Satellite Packet Network (WBCNET)
+         Host Access Protocol (HAP) has 16 bit addresses for hosts.  It
+         is possible to assign several addresses to one physical host,
+         so the addresses are logical addresses.  The 16 bit WBCNET
+         address is divided into a HAP Number field and a Local Address
+         field, and is located in the 24 bit internet local address as
+         shown below.  Please see [2] for more details.
+
+         The network number of the WBCNET is 28 (Class A).
+
+         +--------+--------+
+         | HAP NUM| LCL ADD|   WBCNET
+         +--------+--------+
+              8        8
+
+         +--------+--------+--------+--------+
+         |   28   | HAP NUM|  ZERO  | LCL ADD|   IP
+         +--------+--------+--------+--------+
+              8        8        8        8
+
+
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+
+
+
+Postel                                                          [Page 6]
+
+
+                                                          September 1981
+RFC 796                                                 Address Mappings
+
+
+
+References
+----------
+
+   [1]     Postel, J. (ed.), "Internet Protocol - DARPA Internet Program
+           Protocol Specification," RFC 791, USC/Information Sciences
+           Institute, September 1981.
+
+   [2]     Pershing J., "Addressing Revisited," Bolt Beranek and Newman
+           Inc., W Note 27, May 1981.
+
+   [3]     Noel Chiappa, David Clark, David Reed, "LCS Net Address
+           Format," M.I.T. Laboratory for Computer Science Network
+           Implementation, Note No.5, IEN 82, February 1979.
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+Postel                                                          [Page 7]
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