In the Internet each network interface of a computer is assigned one, or more, Internet addresses. The nature of these Internet addresses is dependent on network size. For the Internet Standard regarding reserved network numbers (STD 2), each address is a 32-bit string which falls into one of the following three classes:
(1) A class A address, used for the largest networks, begins with a 0 which is then followed by a seven-bit network number, and then a 24-bit local address. However, one is restricted from using the network numbers of all 0’s or all 1 ’s and the local addresses of all 0’s or all 1 ’s.
(2) The class B address is meant for an intermediate-sized network. This address starts with the two-bit string 10, which is followed by a 14-bit network number and then a 16-bit local address. But the local addresses of all 0’s or all l’s are not permitted.
(3) Class C addresses are used for the smallest networks. These addresses consist of the three-bit string 110, followed by a 21-bit network number, and then an eight-bit local address. Once again the local addresses of all 0’s or all 1 ’s are excluded. How many different addresses of each class are available on the Internet, for this Internet Standard?
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