Path: utzoo!utgpu!watmath!clyde!att!ucbvax!A.ISI.EDU!CERF
From: CERF@A.ISI.EDU
Newsgroups: comp.protocols.tcp-ip
Subject: re: Running out of Internet addresses?
Message-ID: <[A.ISI.EDU]29-Nov-88.10:57:22.CERF>
Date: 29 Nov 88 15:57:00 GMT
References: <8811281821.AA00300@bel.isi.edu>
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 16

Jon,

The way I read it, there are 127 possible class A nets,
16,383 class B nets, roughly 2M+ class C nets, and a
bunch (2**28 - 1) of broadcast addresses.

The large number of class C nets available should have been
sufficient, but we are experiencing some difficulty dealing
with large numbers of nets at the IP gateway level (table
and routing update sizes). Subnetting works better with
class B network format, because there is some room for subnet
and host address space. Reparsing the class C address space
might be a helpful step towards making more nets effectively
available.

Vint