Current PC (desktop+laptop) and Android sales are about equal at 350MM/year, with iPhones ~150MM/year and iPads closing in on 100MM/year: or near 1Bn new personal compute devices per year.
With current growth rates, how soon will we saturate the IPV4 address space?
There are two questions in there:
- How many IPV4 addresses are left?
- Where? Each region has its own challenges.
- How fast is the demand for Internet addresses growing?
- New Sales are not the whole story: replacements account for most sales in mature markets.
- The active PC fleet is now somewhat static.
- When the smartphone and tablet markets mature, Sales will still hold up with replacements catering for the 2-5 year product life.
The 32-bit IPV4 address space can assign no more than 4Bn unique identities.
My guesstimate of realised assigned unique addresses is 2-3Bn.
Smartphone network providers can use private addresses and NAT's to hide 10,000 "access-only" devices behind a single IP number, somewhat reducing the problem.
Looking at Horace's charts:
- smartphone sales are doubling each year
- the high-growth phase may last 5-7 years, but that's not data in the chart.
- we can't know if there is a new App coming that will require fully exposed IP addresses, requiring IPV6.
The decider will be the Network Operators: If they see an advantage, marketing or technical, in going to IPV6.
Or maybe when total smartphone and tablet sales are well over 1Bn/year.