CIDR (2)

• The inflexibility of the traditional A-B-C scheme meant addresses were frequently wasted
• CIDR addresses are classless
• The network prefix comprises the network address and the mask: x.y.z.w/22 is equivalent to using a network mask 255.255.252.0 (the first 22 bits identify the network)
• addresses can be supernetted and subnetted (supernetting means combining two or more contiguous network addresses: for example 4 class C networks can be combined in one 128.230.117.0/22)

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