IPv6 Subnet tool

[David Conrad]

On Jan 14, 2009, at 6:22 PM, Jay Hennigan wrote:
> David Conrad wrote:
>> On Jan 14, 2009, at 12:55 PM, Joe Abley wrote:
>>> Perhaps I'm just not seeing the problem that assigning a /56 solves.
>> How many /12s, /18s, /19s, and even /32s are their in IPv6 compared  
>> to IPv4?  :-)
> Exactly the same number.

Indeed.

> But each of them is a *substantially* larger subnet.


True.  However, despite this, current policy has resulted in  
consumption patterns that don't look all that different than with IPv4  
in the mid-90s -- /20s, /19s, even a /12.  Of course it is stunningly  
unlikely the recipients of those prefixes would ever need to come back  
for address space, at least given current usage.  Of course, they said  
that about IPv4 too... :-)

Revisions to the allocation policies, including /56s and changing the  
HD ratio, were intended to address (pun intended) these sorts of  
observations.  I'll let others argue about whether the revisions were  
good ideas.

Regards,
-drc