Class A IP Addressing

1.0.0.0/8 to 126.0.0.0/8 (126 Networks)



NNNNNNNN.HHHHHHHH.HHHHHHHH.HHHHHHHH
0xxxxxxx.xxxxxxxx.xxxxxxxx.xxxxxxxx


    Having 24 bits for host addresses means that each Class A network has 16,777,216 mathematically possible host addresses. the first bit of the first octet must be 0.

    The highest value of the first octet is 01111110 or 126 (64 + 32 + 16 + 8 + 4 + 2 + 0)

    The last three octets of a Class A address represent possible host addresses within each specific network number. Individual host addresses can be duplicated within each network address.

    The range of possible Class A network addresses is from 1.0.0.0 to 127.0.0.0

    Valid host addresses for Class A networks range from x.0.0.0 to x.255.255.255 .

    Hosts 18.56.23.32 and 18.150.242.17 would be on the same network (18.0.0.0).



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