Adding four more bits to the Left of the Source Address and setting
those bits to 1111 (0xF) can help to start the migration to "Regions"
and more IPv4 Addresses - Using and Re-Using legacy
spectrumhttp://www.iana.org/assignments/ipv4-address-space/ipv4-address-space.txt
16 /8s for "Future use" - it looks like the "Future" has arrived
240/8 Future use 1981-09
RESERVED [15]
241/8 Future use 1981-09
RESERVED [15]
242/8 Future use
...
253/8 Future use 1981-09
RESERVED [15]
254/8 Future use 1981-09
RESERVED [15]
255/8 Future use 1981-09
RESERVED [15]
http://tools.ietf.org/html/draft-gundavelli-v6ops-community-wifi-svcs-014.13.
Overlapping IPv4 Address Support Wi-Fi Service Provider may segment the
network into regions. Two regions may use overlap IPv4 address space. This
is particularly important when the Internet is transitioning to IPv6. The
Wi-Fi SP may not have enough unique public IPv4 addresses to globally
address large number of Wi-Fi device.
