number of unaggregated class C's in swamp?

William Allen Simpson bsimpson at
Sat Sep 30 09:19:47 UTC 1995

> Date:         Fri, 29 Sep 1995 20:16:54 -0400
> From: Dennis Ferguson <dennis at>
> The one thing that hasn't been done, however, is to set an actual
> goal for routing efficiency.


> I'd like to state my guess that a good number to aim at might be
> about 1200 routes per fully-utilized class-A-sized chunk of address
> space.  This would put the IPv4 end state at a maximum of about 250,000
> routes, ...
> I like the idea of measuring each and every class-A-sized block
> against some standard separately, since a lot of the class-C space has
> been allocated to regional registries this way and it inconveniences
> those places which have done the best the least.  I'm less attached to
> the number 1200 in particular, but I do think an explicit target should
> be chosen which represents both a tractable limit to design big routers for
> and which allows the implementation of efficient address allocation strategies
> which won't have to be tighened over time.

I suggest that it be 2048 for each _pair_ of class As, since that's how
they were assigned in RFC-1366 & 1466.

Bill.Simpson at
          Key fingerprint =  2E 07 23 03 C5 62 70 D3  59 B1 4F 5E 1D C2 C1 A2

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