RFC - 950

Internet Standard Subnetting Procedure

Original:	ftp://ftp.isi.edu/in-notes/rfc950.txt
Authors:	J. Mogul [Stanford], J. Postel [ISI]
Date:	August 1985
Category:	Standard: STD-5 ]

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Updates:
RFC-792std5 [STD 5]	Internet Control Message Protocol (Updated by RFC-4884prop, RFC-950std5)

Referred by:	68 RFC
Refers to:	9 RFC

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Status

This RFC specifies a protocol for the ARPA-Internet community. If subnetting is implemented it is strongly recommended that these procedures be followed. Distribution of this memo is unlimited.

Abstract

This memo discusses the utility of "subnets" of Internet networks, which are logically visible sub-sections of a single Internet network. For administrative or technical reasons, many organizations have chosen to divide one Internet network into several subnets, instead of acquiring a set of Internet network numbers. This memo specifies procedures for the use of subnets. These procedures are for hosts (e.g., workstations). The procedures used in and between subnet gateways are not fully described. Important motivation and background information for a subnetting standard is provided in RFC-940 [7].

Acknowledgment

This memo is based on RFC-917 [1]. Many people contributed to the development of the concepts described here. J. Noel Chiappa, Chris Kent, and Tim Mann, in particular, provided important suggestions. Additional contributions in shaping this memo were made by Zaw-Sing Su, Mike Karels, and the Gateway Algorithms and Data Structures Task Force (GADS).

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