Assigned numbers (RFC0820)
Original Publication Date: 1982-Aug-14
Included in the Prior Art Database: 2000-Sep-13
Internet Society Requests For Comment (RFCs)
Network Working Group J. Postel
Request for Comments: 820 J. Vernon
Obsoletes RFCs: 790, 776, 770, 762,
758, 755, 750, 739, 604, 503, 433, 349
Obsoletes IENs: 127, 117, 93
This Network Working Group Request for Comments documents the currently
assigned values from several series of numbers used in network protocol
implementations. This RFC will be updated periodically, and in any case
current information can be obtained from Jon Postel. The assignment of
numbers is also handled by Jon, subject to the agreement between
DARPA/IPTO and DDN/PMO about number allocation, documented in Appendix A
of this RFC. If you are developing a protocol or application that will
require the use of a link, socket, port, protocol, or network number
please contact Jon to receive a number assignment.
USC - Information Sciences Institute
4676 Admiralty Way
Marina del Rey, California 90291
phone: (213) 822-1511
ARPANET mail: POSTEL@ISIF
The ARPANET community is making the transition form the ARPANET to the
ARPA Internet. This has been characterized as the NCP/TCP transition
, although many other the protocols are involved, too. The working
documents for the new Internet environment have been collected by the
Network Information Center (NIC) in a book entitled the "Internet
Protocol Transition Workbook" .
Most of the protocols mentioned here are documented in the RFC series of
notes. The more prominent and more generally used are documented in the
"Internet Protocol Transition Workbook" or in the old "Protocol
Handbook"  prepared by the NIC. Some of the items listed are
In all cases the name and mailbox of the responsible individual is
indicated. In the lists that follow, a bracketed entry, e.g., [17,iii],
at the right hand margin of the page indicates a reference for the
listed protocol, where the number cites the document and the "iii" cites
RFC 820 January 1983
ASSIGNED NETWORK NUMBERS
The network numbers listed here are used as internet addresses by the
Internet Protocol (IP) [33,62]. 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 3 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 Addr...