North American Network Operators Group
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Re: CIDR FAQ

  • From: Paul A Vixie
  • Date: Wed Aug 16 16:25:50 1995 
> > class c nets, which are 2/3 the total.
> 
> Why can' the NIC reallocat the old class c's and use CIDR?

They are trying.  But you can only lead this horse to water -- we can't take
prefixes away, we can only make them harder or more expensive to get routing
for.  This is a lengthy process, and its success is the only reason we still
have a 30,000 element core routing table -- endpoint growth never stopped, but
new prefixes are all fairly short, and there has been a nearly corresponding
drop in old (long, expensive) prefixes in recent months.  As Randy pointed out,
though, we've probably about squoze all the water out of the old classC sponge.