what are causes of IP address depletion in IPv4

what are causes of IP address depletion in IPv4?
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Joseph DalyCommented:
IPV4 was originally created when the ideas of billions of computers being connected to a network was a far fetched idea. The original 32 bit number system only allowed for  just around 4 billion give or take unique ip addresses. Take into account that in early years these ip addresses were given out in large blocks of addresses, class A B C there are only a finite number of IPv4 addresses available and an ever increasing need for unique IP addresses.

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When IPV4 (mid-70's) was originally created the Internet was a restricted use network. Governments (including military), educational facilities, and companies doing business with governments and educational facilities.

Not only that but computers were big and expensive. Nobody every expected that between the governments, educational facilities and the companies doing work with/for them we would ever have billions of computers.

In the early 90's the Internet was opened to everybody and anybody and by then computers were smaller and cheaper.  So the number of computers on the Internet started to grow and grow.

We think today, how could anybody ever think that 4 billion address would be enough. Well sooner or later somebody else it going to say, how could anybody ever think that 340,282,366,920,938,463,463,374,607,431,768,211,456 addresses would be enough. :)
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