Classful network

Rarity: Common

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What Wikipedia says

A classful network is an obsolete network addressing architecture used in the Internet from 1981 until the introduction of Classless Inter-Domain Routing (CIDR) in 1993. The method divides the IP address space for Internet Protocol version 4 (IPv4) into five address classes based on the leading four address bits.

Excerpt from the Wikipedia article “Classful network”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Jon Postel, Public domain, via Wikimedia Commons.