{8Bits}. {8Bits}. {8Bits}. {8Bits} / {Allocated Bits}
00000000 = 0
11111111 = 255
Example: 102.123.149.240 / 24
Allocated Bits To Address Allocated For Range
102.123.149 .240 / 24 => 102.123.149.000 - 102.123.149.255
102.123 .149.240 / 16 => 102.123.000.000 - 102.123.255.255
102.123 .149.240 / 20 => 102.123.144.000 - 102.123.159.255
Algorithm For 102.123.149/20
102.123 => 8+8 => 16 Bits Used Remained 4
149 => 1 0 0 1 0 1 0 1 => 1 + 4 + 16 +128
First 4 are allocated we will use remained ones
1 0 0 1 0 0 0 0 to 1 0 0 1 1 1 1 1
=> 128+16 to 128+16+8+4+2+1
=> 144 to 159
Thus =>
102.123.144.000 - 102.123.159.255
