But Isn’t There Still Lots of IPv4 Address Space Left?
approx. half the IPv4 space is unallocated today
- how long does it take for the number of IP devices to double?
IPv4 addresses are effectively being rationed
=> consumption statistics tell us nothing about the real demand for addresses, or the hardship created by witholding them
- the difficulty in obtaining addresses is why many (most?) of the NAT-ALGs exist
new kinds of Internet devices will be much more numerous, and not adequately handled by NATs (e.g., mobile phones, cars, residential servers, ...)