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lets consider
IP address of 172.16.2.160 with a subnet mask of 255.255.0.0
To find the network address, convert the IP address to binary¨C10101100 000100000 00000010 10100000¨Cthen ANDed it with the subnet mask¨C11111111 11111111 00000000 00000000. The rest is 10101100 00010000 00000000 00000000, which is 172.16.0.0 in decimal.
The first octet rule states that the class of an address can be determined by the numerical value of the first octet.
Posted by marco12
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