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Printable Version: RFC1166.PDF
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 HOSTMASTER@NIC.DDN.MIL.
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]