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Subnetting

Class C Table

Value Subnet Host Remarks
Slash Binary Dec. Total Usable  Bits Total Usable  Bits Used as:
                   
/24  0000 0000    0   0 0 0 256 254 8 Network
                   
/25 1000 0000 128 2 0 1 128 126 7  
/26 1100 0000 192 4 2 2 64 62 6  
/27 1110 0000 224 8 6 3 32 30 5  
/28 1111 0000 240 16 14 4 16 14 4  
                   
/29 1111 1000 248 32 30 5 8 6 3  
/30 1111 1100 252 64 62 6 4 2 2  
/31 1111 1110 254 128 126 7 2 0 1  
/32 1111 1111  255   256  254 8 1 0 0  Broadcast

 
Subnet /28 has address of 255.255.255.240.
 
The number 240 in binary has half its bits as one's and the other half nought's:-
240 = 1111 0000

The following table shows the network and broadcast address for each /28 subnet:-
 
Network Broadcast
   
0 15
16 31
32 47
48 63
64 79
80 95
96 111
112 127
128 143
144 159
160 175
176 191
192 207
208 223
224 239
240 255

 

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(c) Compiled by B V Wood.

 

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