[ppml] HD Ratio changes

Ian Baker ibaker at codecutters.org
Tue Feb 10 08:06:23 EST 2004

----- Original Message ----- 
From: <Michael.Dillon at radianz.com>
To: <ppml at arin.net>
Sent: Tuesday, February 10, 2004 12:05 PM
Subject: [ppml] HD Ratio changes

> I've made some changes to the wording of the policy. First of all
> I've made the use of the HD Ratio optional. Secondly, I've decided
> to use the natural logarithm in the calculation because PERL has
> this and not the base 10 logarithm. The end result of the ratio
> calculation is identical, but now people will see that is clearly
> is easy to add the calculation to PERL IP address management
> systems. The Excel function LN(x) is the same as PERL's log(x).

log10(x) = ln(x) / ln(10)

The ratio will, of course, cancel-out the conversion factor.

Incidentally, how were the ratio values derived? 31% utilization[1] before a
/8 reallocation seems a bit low to me (just a gut feeling, you


Ian Baker
Webmaster, codecutters.org

1. http://www.codecutters.org/temp/HD-Ratio.xls

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