A couple of recent threads here and my general sense of the (lack of) urgency 
around IPv6 deployment has made me wonder whether setting aside a /10 under 
NRPM 4.10 - Dedicated IPv4 block to facilitate IPv6 Deployment - is really 
going to be enough. I was looking at Geoff Huston's graphs 
(http://www.potaroo.net/tools/ipv4/) and noticed that both RIPE and APNIC, by 
coincidence, will be using up the first /10 out of their reserved /8s at about 
the same time, near the end of this year. A naive calculation says that APNIC 
will go through the /10 in about 3.5 years, and RIPE in about 2.2 years. Of 
course it is difficult to predict how the runout of the reserved /10 under 4.10 
will look, but I think it's reasonable to assume that it won't be any slower 
than 2-3 years, since unlike RIPE and APNIC there's no limit to how much space 
an entity can receive under 4.10, only the pace at which it can be handed out; 
assuming the maximum rate, a /22 can be issued to someone every two years, r
 ather than once and done as with the other two RIRs.

Given that the inventory currently contains one /9 and one /10, we are getting 
close to the point where any additional set-asides will no longer be possible, 
so I thought it might be worthwhile at least considering whether the 4.10 pool 
ought to be enlarged while it still can be. . .

Bill.
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