Practical TCP/IP and Ethernet Networking for Industry

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To alleviate this problem, the concept of classless inter-domain routing (CIDR) was

introduced. Basically, CIDR removes the imposition of the class A, B and C address

masks and allows the owner of a network to ‘supernet’ multiple addresses together. It

then allows the concentrating router to aggregate (or ‘combine’) these multiple

contiguous network addresses into a single route advertisement on the Internet.

Take the same example as before, but this time allocates contiguous addresses. Note

that ‘w’ can have any value between 1 and 255 since the address classes are no longer

relevant.

w x y ...