North American Network Operators Group

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Efficient (Dense) Use of Address Blocks

  • From: Sean Shapira
  • Date: Mon Mar 20 17:20:45 1995

Karl wrote:
> > My request was for 256 Class "C"s.  We have consumed almost 
> > exactly that in a year.

And Alan added:
> I did the same.  [...]  Interpath has
> not *QUITE* used up the block, but pretty darn close

Can either of you provide estimates of how densely these blocks 
are populated?  What percentage of the individual host addresses 
are currently used by functioning hosts (or router interfaces)?

Perhaps you're both saying you re-assigned use of these address 
blocks quickly, rather than saying you populated them densely
with actual hosts?

One could imagine ISPs (not Karl or Alan, surely!) who might
re-assign blocks of class C (octet-wide) networks when a single 
one would suffice.  Or they might assign octet-wide networks when 
quartet-wide (nibble) networks would suffice; or even quartet-wide 
networks when triplet-wide networks would suffice.

I believe ISPs who receive large blocks have a responsibility to
make sure they (and their customers) use them efficiently.  How
efficiently, you ask?  If you're not getting more than one U.S.
dollar of value per host address per year, you're not using it
efficiently in my book!

Sean Shapira         [email protected]         +1 206 443 2028
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               Serving the Net since 1990.