Current Consensus on IPv6 Customer Allocation Size

Mikael Abrahamsson swmike at
Thu Aug 2 08:30:01 CEST 2012

On Wed, 1 Aug 2012, Tim Densmore wrote:

> trying to come up with a reasonable numbering plan that can accommodate /48 
> customer assignments from our /32.

First of all, /32 is the default allocation you get without justification, 
right. So if you justify, you will get more. Do a proper justification 
now, not in 3 years, so you're on the right track by trying to find out.

If you want a big subnet, planning to hand out /48 to everybody will give 
you a lot of addresses, increasing flexibility down the road.

Personally I advocate handing out /56 to residential and /48 to business. 
This just seems like a reasonable compromise between "should be plenty for 
99% or more of the use cases" and let's aim for the sky. /60 seems short 
sighted for residential.

Mikael Abrahamsson    email: swmike at

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