What is classless addressing and why is it used?

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what is the classless addressing and why it is used when we have classful addressing scheme ?
 

Re: Classless Addressing

All IP addresses have a network and host portion. In classful addressing, the network portion ends on one of the separating dots in the address (on an octet boundary). Classless addressing uses a variable number of bits for the network and host portions of the address.
 

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