Limitations of IPV4
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Limitations of IPV4

 

Scarcity of IPv4 Addresses: The IPv4 addressing system uses 32-bit address space. This 32-bit address space is further classified to usable A, B, and C classes. 32-bit address space allows for 4,294,967,296 IPv4 addresses, but the previous and current IPv4 address allocation practices limit the number of available public IPv4 addresses. Many addresses which are allocated to many companies were not used and this created scarcity of IPv4 addresses.

Solution of this problem NAT(Network address translation) is widely used.

     

Related : Difference (b/w) between IPV4 & IPV6