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class full addressing is replaced with classless addressing.


The problem with this class full addressing method is that millions of class A address are wasted, many of the class B address are wasted, 
whereas, number of addresses available in class C is so small that it cannot cater the needs of organizations.

Class D addresses are used for broadcasting routing, and are therefore available as a single block only.

Class E addresses are reserved for research purpose.

Note: Because of these problems, class full networking was replaced by Classless Inter-Domain Routing (CIDR) 

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