ipv4 cidr block for idiots code example

Example: ipv4 cidr block for idiots

Class    Binary Prefix    Range                       Network Bits
A        0*               0.0.0.0-127.255.255.255     8
B        10*              128.0.0.0-191.255.255.255   16
C        110*             192.0.0.0-223.255.255.255   24
D        1110*            224.0.0.0-239.255.255.255
E        1111*            240.0.0.0-255.255.255.255

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