[pgeorgi]

That's approximately a /17 worth of IPv4 addreses, recovered over multiple years going through all the low hanging fruit (eg the original /8 networks).

9 million addresses for 2 years is a burn rate of ~375k/month. Another 2 million newly obtained addresses in the next 2 years will last 6 more months.

At some point IPv6 will become more economical.

[tialaramex]

It's already more economical, it's just not surfaced very well economically. People hide the price of IPv4.

One of the IPv6 ISPs did a talk about this, they realised that rather than hiding this cost they could surface it and then magically instead of "Try to persuade technical people to choose IPv6" the situation is "Make technical people explain to their finance department why they're spending the extra money" and what do you know, "Learn IPv6" is way more popular than "Argue with accountants".