Required reading.. The Cuckoos Egg
This will give you a deeper foundational history of IPV4 networks.
Large telecoms love IPV4 they like to sell scarcity. They make more money and provide less service when things are scarce and their competition is at bay b/c there is no name/number resources left for new players to enter the market at low cost.
This is the primary reason they (the big telecoms) have been slow to move to IPV6.
The situation has left the entire world with a huge technology gap; and has presented us with an opportunity to fill that gap in the Telecom Mafia Racket's overwhelming greed.