quest4tech.net


  

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

 
In the above table the subnet number is given after the slash and its values given in binary and decimal. How the subnet is used is given in the Remarks column.

Subnet /28

Subnet /28 has address of 255.255.255.240.

Nunber 240

Note the value of 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

 

Books on Cisco CCNA Cerification. Click here for UK or here for USA.

Questions and Answers on CCNA exams. Click here for UK or here for USA.

Books on Comms, Computers, Hardware and Software. Click here for UK or here for USA.

To add an entry or request an existing one to be altered, please fill in the comments form

Return to Top

Return to Index

(c) Compiled by B V Wood.

 

  Main Index
UK SPONSERS


USA SPONSERS