How Many Addresses?
10 Billion people by 2020
Each person has more than one computer
Assuming 100 computers per person ? 1012 computers
More addresses may be required since
- Multiple interfaces per node
- Multiple addresses per interface
Some believe 26 to 28 addresses per host
Safety margin ? 1015 addresses
IPng Requirements ? 1012 end systems and 109 networks. Desirable 1012 to 1015 networks