Thing that have been talked and dealt with, the shortage of IPv4 hence IPv6 have been introduced and tested. It has been said that IPv4 ran out because of the number of users acquiring IP addresses. I think it should be also made clear that some network owner constitute to this shortage. I don't know whether they do this deliberately or unaware because of ignorance. The fixed lenght sudnet mask (FLSM) do further this shortage because the number of host is also fixed.
For example, a class B network using 255.255.240.0 as a subnet mask can approximately accommodate 8000 host per subnet but in real life a class B network usually require much lesser number of host. If a network will only have 2000 host that mean the rest 6000 IP addresses a being wasted because no other network can be assign to.
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