RFC 1878 (rfc1878) - Page 1 of 8

Variable Length Subnet Table For IPv4

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Network Working Group                                         T. Pummill
Request for Comments: 1878                                       Alantec
Obsoletes: 1860                                               B. Manning
Category: Informational                                              ISI
                                                           December 1995

                 Variable Length Subnet Table For IPv4

Status of this Memo

   This memo provides information for the Internet community.  This memo
   does not specify an Internet standard of any kind.  Distribution of
   this memo is unlimited.


   This memo clarifies issues surrounding subnetting IP networks by
   providing a standard subnet table.  This table includes subnetting
   for Class A, B, and C networks, as well as Network IDs, host ranges
   and IP broadcast addresses with emphasis on Class C subnets.

   This memo is intended as an informational companion to Subneting RFC
   [1] and the Hosts Requirements RFC [2].


   The growth of networking since the time of STD 5, RFC 950 and STD 3,
   RFC 1123 has resulted in larger and more complex network subnetting.
   The previously mentioned RFCs comprise the available guidelines for
   creating subnetted networks, however they have occassionaly been
   misinterpreted leading to confusion regarding proper subnetting.

   This document itemizes the potential values for IPv4 subnets.
   Additional information is provided for Hex and Decmial values,
   classfull equivalants, and number of addresses available within the
   indicated block.

Pummill & Manning            Informational

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