[arin-discuss] IPv6 End User Assignments

[michael.dillon at bt.com]

> But that 8192 possible customers is if you only give 1 IP per 
> customer (/32) and you have one huge subnet (the /20 itself); 

> The 65536 /48's within your /32 is more realistic given that 
> a /48 is probably enough for most customers.  They can subnet 
> all they like and still have a lot of addresses.  You could 
> indeed sustain 65K customers in your /32 and give them all /48's.

This is a nice illustration of how much more efficient IPv6 is
even though you give a /48 per customer, and they use a whole
/64 per subnet regardless of the number of devices. We've moved
from a /32 being enough for one customer (maybe), to a /32 being 
enough for an entire ISP. A lot of ISPs fall into the size range
where this is possible.

--Michael Dillon