Map of IPv4 circa 2015
IPv4 was never meant to enter service, according to Vint Cerf who created IPv4 it was only meant as a DEMO protocol.
https://youtube.com/watch?v=Hf0rjtnwC9A
Among other disadvantages IPv4 has unencrypted headers.
The reason cryptographers laugh when Brennan or Admiral Mushrooom-head Hayden or other seditious spook says "we only look at the 'meta data' "
is
looking at meta data tells more than reading the messages plaintext.
The internet was deliberately created to serve the intelligence agencies purposes: surveillance, subversion, social sabotage, consumer manipulation etc.