Classful networking is the name given to the first round of changes to the structure of the
IP address in
IPv4.Classful networking is obsolete on the modern Internet. There is no longer any such thing as a class A/B/C network. The correct modern representation for what would have been referred to as a "Class B" prior to 1993 would be "a set of /16 addresses", under the
Classless Inter-Domain Routing (CIDR) system.
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