• What Is IP Addressing Scheme? & Its Types

    IP (Internet Protocol) Addressing Scheme

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    IP Addressing Scheme

    An IP address is a unique identifier used to locate a device on the IP network. the address structure is subdivided into the network ID and the host ID.  The first IP of a network is network number and the last IP is reserved for Broadcast IP.


    There are 2 types of Addressing in IP.

    • CLASSFUL ADDRESSING
    • CLASSLESS ADDRESSING


    class full Addressing – 


    • An IP address allocation the method that allocates IP addresses according to Five major Classes.
    • Less Practical
    • Network ID and Host ID changes depending on the Classes.
    • Classful addressing categorizes the IP addresses into Five Major Classes: Class A, B, C, D, and E.
    Class A Address

    The first bit of the first octet is always set to 0 (zero). 
    Thus the first octet ranges from 1 – 127.



    ·         The network ID is 8 bits long.
    ·         The host ID is 24 bits long.
    • The default subnet mask for Class A is 255.x.x.x.

    If You Read About What is Default Gateway? Click On Link

    Class B Address

    An IP address which belongs to class B has the first two bits in the first octet set to 10.
    Thus the Second octet ranges from 128 – 191.



     ·         The network ID is 16 bits long.
    ·         The host ID is 16 bits long.
    •  The default subnet mask for class B is 255.255.x.x. 



    Class C Address

    The first octet of Class C IP address has its first 3 bits set to 110.
    Thus the Third octet ranges from 192 – 223.


    ·         The network ID is 24 bits long.
    ·         The host ID is 8 bits long.
    • The default subnet mask for class C is 255.255.255.x. 


    Class D Address

    first four bits of the first octet in Class D IP addresses are set to 1110.
    Thus the Third octet ranges from 224 – 239.



    • Class D is reserved for Multicasting.
    • Class D has an IP address range from 224.0.0.0 to 239.255.255.255.


    Class E Address

    This IP Class is reserved for experimental purposes & research purposes only for R&D or Study.

    • IP addresses in this class range from 240.0.0.0 to 255.255.255.254.
    • This class doesn’t have any subnet mask. 

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    Private IP



    Classless Addressing -


    • An IP Address Allocation method that is designed to replace classful addressing to Minimize the Rapid Exhaustion of IP Address.
    • More Practical and Useful.
    • There is no boundary on Network ID and Host ID.
    • Classless addressing is also called Classless Inter-Domain Routing (CIDR).

    For example, Assume that the Classless Address is 192.168.1.35/27





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