rfc1166.txt

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Network Working Group                                     S. Kirkpatrick
Request for Comments: 1166                                      M. Stahl
Obsoletes RFCs: 1117, 1020, 997, 990, 960, 943,                M. Recker
943, 923, 900, 870, 820, 790, 776, 770, 762,                   July 1990
758, 755, 750, 739, 604, 503, 433, 349
Obsoletes IENs:  127, 117, 93


                            INTERNET NUMBERS

Status of this Memo

   This memo is a status report on the network numbers and autonomous
   system numbers used in the Internet community.  Distribution of this
   memo is unlimited.

Table of Contents

   Introduction....................................................   1
   Network Numbers.................................................   4
   Class A Networks................................................   7
   Class B Networks................................................   8
   Class C Networks................................................  47
   Other Reserved Internet Addresses............................... 100
   Network Totals.................................................. 101
   Autonomous System Numbers....................................... 102
   Documents....................................................... 111
   Contacts........................................................ 115
   Security Considerations......................................... 182
   Authors' Addresses.............................................. 182

Introduction

   This Network Working Group Request for Comments documents the
   currently assigned network numbers and gateway autonomous systems.
   This RFC will be updated periodically, and in any case current
   information can be obtained from Hostmaster at the DDN Network
   Information Center (NIC).

         Hostmaster
         DDN Network Information Center
         SRI International
         333 Ravenswood Avenue
         Menlo Park, California  94025

         Phone: [phone]

         Network mail: [e-mail]



Kirkpatrick, Stahl & Recker                                     [Page 1]

RFC 1166                    Internet Numbers                   July 1990


   Most of the protocols used in the Internet are documented in the RFC
   series of notes.  Some of the items listed are undocumented.  Further
   information on protocols can be found in the memo published by the
   Internet Activites Board (IAB), "IAB Official Protocol Standards"
   [52], which describes the state of standardization of protocols used
   in the Internet.  This document is issued quarterly.  Current copies
   may be obtained from the DDN Network Information Center.

   The lists below contain the name and network mailbox of the
   individuals responsible for each registered network or autonomous
   system.  The bracketed entry, e.g. [nn,iii], at the right hand margin
   of the page indicates a reference for the listed network or
   autonomous system, where the number ("nn") cites the document and the
   letters ("iii") cite the NIC Handle of the responsible person.  The
   NIC Handle is a unique identifier that is used in the NIC
   WHOIS/NICNAME service.  People occasionally change electronic
   mailboxes.  To find out the current network mailbox or phone number
   for an individual, or to get information about a registered network,
   use the NIC WHOIS/NICNAME service or contact [e-mail].

   The convention used for the documentation of Internet Protocols is to
   express numbers in decimal and to picture data in "big-endian" order
   [39].  That is, fields are described left to right, with the most
   significant octet on the left and the least significant octet on the
   right.

   The order of transmission of the header and data described in this
   document is resolved to the octet level.  Whenever a diagram shows a
   group of octets, the order of transmission of those octets is the
   normal order in which they are read in English.  For example, in the
   following diagram the octets are transmitted in the order they are
   numbered.

       0                   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       |       2       |       3       |       4       |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |       5       |       6       |       7       |       8       |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |       9       |      10       |      11       |      12       |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

                           Transmission Order of Bytes


   Whenever an octet represents a numeric quantity the left most bit in
   the diagram is the high order or most significant bit.  That is, the



Kirkpatrick, Stahl & Recker                                     [Page 2]

RFC 1166                    Internet Numbers                   July 1990


   bit labeled 0 is the most significant bit.  For example, the
   following diagram represents the value 170 (decimal).

                               0 1 2 3 4 5 6 7
                              +-+-+-+-+-+-+-+-+
                              |1 0 1 0 1 0 1 0|
                              +-+-+-+-+-+-+-+-+

                              Significance of Bits

   Similarly, whenever a multi-octet field represents a numeric quantity
   the left most bit of the whole field is the most significant bit.
   When a multi-octet quantity is transmitted the most significant octet
   is transmitted first.





































Kirkpatrick, Stahl & Recker                                     [Page 3]

RFC 1166                    Internet Numbers                   July 1990


NETWORK NUMBERS

   The network numbers listed here are used as internet addresses by the
   Internet Protocol (IP) [14,26].  The IP uses a 32-bit address field
   and divides that address into a network part and a "rest" or local
   address part.  The division takes 4 forms or classes.

      The first type of address, or class A, has a 7-bit network number
      and a 24-bit local address.  The highest-order bit is set to 0.
      This allows 128 class A networks.


                            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 of address, class B, has a 14-bit network number
      and a 16-bit local address.  The two highest-order bits are set to
      1-0.  This allows 16,384 class B networks.


                            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 of address, class C, has a 21-bit network number
      and a 8-bit local address.  The three highest-order bits are set
      to 1-1-0.  This allows 2,097,152 class C networks.


                            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




Kirkpatrick, Stahl & Recker                                     [Page 4]

RFC 1166                    Internet Numbers                   July 1990


      The fourth type of address, class D, is used as a multicast
      address [13].  The four highest-order bits are set to 1-1-1-0.


                            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 1 0|                  multicast address                    |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+