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The document discusses the transition from classful networks to classless inter-domain routing (CIDR) networks. CIDR allows for more flexibility in assigning blocks of IP addresses and improves routing efficiency by allowing routes to be aggregated. Valid CIDR blocks must have the host bits set to zero so the address falls on the network boundary. Large blocks are allocated by regional organizations like RIPE and then assigned to ISPs and other organizations in smaller blocks.
![Classless networks - Why? ,[object Object],[object Object],[object Object],[object Object],[object Object]](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)