![]() The figure highlights one important fact: in all subnetting schemes, the last subnet octet always corresponds to the interesting octet described in the OCG book. The next one divides the network in eight subnets (/27) and the last one in sixteen subnets (/28). The second one corresponds to a /26, which divides the network in four subnets. The first one corresponds to a /25 mask, which divides the original network in two subnets. The figure shows four different subnetting schemes. Therefore, the subnet ID will be 10.0.50.72/29.īut, at this point, you may ask yourself: why does it work? In order to understand this process, let’s have a look at the following figure: The value ‘X’ will be the largest multiple of 8 that is less than 76, which is 72. To find the last octet ‘X’, we have to follow the step 3 and calculate the magic number as 256 – 248 = 8. Following the previous procedure, since the first three octets are 255, to find the resulting subnet ID we just need to copy the first three octets of the IP address: 10.0.50.X. In this case, the subnet mask in dotted decimal notation (DDN) is 255.255.255.248.
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