Classful network design served its purpose in the startup stage of the... - dofaq.co
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Classful network design served its purpose in the startup stage of the...

wikipedia - 22 Oct 2019
Classful network design served its purpose in the startup stage of the Internet, but it lacked scalability in the face of the rapid expansion of the network in the 1990s. The class system of the address space was replaced with Classless Inter-Domain Routing (CIDR) in 1993. CIDR is based on variable-length subnet masking (VLSM) to allow allocation and routing based on arbitrary-length prefixes.

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