RFC relevance of mappings

As per Relevance of the word mappings, we have this rfc below:

Network Working Group J.
Request for Comments: 796
Replaces: IEN 115 September 1981
ADDRESS
----------------

Internet
------------------

This memo describes the relationship between address fields used
the Internet Protocol (IP) [1] and several specific networks

An internet address is a 32 bit quantity, with several codings
shown below

The first type (or class a) of address has a 7-bit network number
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

The second type (or class b) of address has a 14-bit network
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

The third type (or class c) of address has a 21-bit network
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

The local address carries information to address a host in
network identified by the network number. Since each network has

Postel [Page 1]

September 1981
RFC 796 Address

particular address format and length, the following section
the mapping between internet local addresses and the actual
format used in the particular network

Internet to Local Net Address
--------------------------------------

The following transformations are used to convert internet
to local net addresses and vice versa

AUTODIN
----------

The AUTODIN II has 16 bit subscriber addresses which
either a host or a terminal. These addresses may be
independent of location. The 16 bit AUTODIN II address
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
+----------------+
16

+--------+--------+--------+--------+
| 26 | ZERO | HOST/TERMINAL |
+--------+--------+--------+--------+
8 8 16

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RFC 796 Address

-------

The ARPANET (with 96 bit leaders) has 24 bit addresses. The 24
bits are assigned to host, logical host, and IMP leader
as illustrated below. These 24 bit addresses are used
for the 24 bit local address of the internet address. However
the ARPANET IMPs do not yet support this form of
addressing so the logical host field is set to zero in
leader

The network number of the ARPANET is 10 (Class A).

+--------+--------+--------+
| HOST | ZERO | IMP |
+--------+--------+--------+
8 8 8

+--------+--------+--------+--------+
| 10 | HOST | LH | IMP |
+--------+--------+--------+--------+
8 8 8 8

----

The Distributed Computing Networks (DCNs) at COMSAT and UCL
16 bit addresses divided into an 8 bit host identifier (HID),
and an 8 bit process identifier (PID). The format
these 16 bits in the low order 16 bits of the 24 bit
address, as shown below

The network number of the COMSAT-DCN is 29 (Class A), and
the UCL-DCN is 30 (Class A).

+--------+--------+
| HID | PID |
+--------+--------+
8 8

+--------+--------+--------+--------+
| 18 | ZERO | HID | PID |
+--------+--------+--------+--------+
8 8 8 8

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RFC 796 Address

---

The Experimental Data Network at the Defense
Engineering Center (DCEC) uses the same type of addresses
the ARPANET (with 96 bit leaders) and has 24 bit addresses
The 24 bits are assigned to host, logical host, and IMP
fields as illustrated below. These 24 bit addresses are
directly for the 24 bit local address of the internet address
However, the IMPs do not yet support this form of
addressing so the logical host field is set to zero in
leader

The network number of the EDN is 21 (Class A).

+--------+--------+--------+
| HOST | ZERO | IMP |
+--------+--------+--------+
8 8 8

+--------+--------+--------+--------+
| 21 | HOST | LH | IMP |
+--------+--------+--------+--------+
8 8 8 8

------

The LCS NET at MIT's Laboratory for Computer Science uses 32
bit addresses of several formats. Please see [3] for
details. The most common format locates the low order 24
of the 32 bit LCS NET address in the 24 bit internet
address, as shown below

The network number of the LCS NET is 18 (Class A).

+--------+--------+--------+
| SUBNET |RESERVED| HOST |
+--------+--------+--------+
8 8 8

+--------+--------+--------+--------+
| 18 | SUBNET |RESERVED| HOST |
+--------+--------+--------+--------+
8 8 8 8

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September 1981
RFC 796 Address

-----

The Packet Radio networks use 16 bit addresses. These
independent of location (indeed the hosts may be mobile).
16 bit PRNET addresses are located in the 24 bit internet
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 |
+--------+--------+
16

+--------+--------+--------+--------+
| net | ZERO | HOST |
+--------+--------+--------+--------+
8 8 16

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RFC 796 Address

------

The Atlantic Satellite Packet Network has 16 bit addresses
hosts. These addresses may be assigned independent of
(i.e., ground station). It is also possible to assign
addresses to one physical host, so the addresses are
addresses. The 16 bit SATNET address is located in the 24
internet local address as shown below

The network number of the SATNET is 4 (Class A).

+--------+--------+
| HOST |
+--------+--------+
16

+--------+--------+--------+--------+
| 4 | ZERO | HOST |
+--------+--------+--------+--------+
8 8 16

------

The Wideband Communication Satellite Packet Network (WBCNET
Host Access Protocol (HAP) has 16 bit addresses for hosts.
is possible to assign several addresses to one physical host
so the addresses are logical addresses. The 16 bit
address is divided into a HAP Number field and a Local
field, and is located in the 24 bit internet local address
shown below. Please see [2] for more details

The network number of the WBCNET is 28 (Class A).

+--------+--------+
| HAP NUM| LCL ADD|
+--------+--------+
8 8

+--------+--------+--------+--------+
| 28 | HAP NUM| ZERO | LCL ADD|
+--------+--------+--------+--------+
8 8 8 8

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RFC 796 Address

----------

[1] Postel, J. (ed.), "Internet Protocol - DARPA Internet
Protocol Specification," RFC 791, USC/Information
Institute, September 1981.

[2] Pershing J., "Addressing Revisited," Bolt Beranek and
Inc., W Note 27, May 1981.

[3] Noel Chiappa, David Clark, David Reed, "LCS Net
Format," M.I.T. Laboratory for Computer Science
Implementation, Note No.5, IEN 82, February 1979.

Postel [Page 7]

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just be content we did not write this in Java, which would have made this "bigger and better" HAHAHHA.

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