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IP Addressing Fundamentals by Mark A. Sportack

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Supernetting

Arguably the single most powerful advance experienced by the IPv4 address space is the capability known as supernetting. Before we delve too deeply into this topic, let's dispel a very popular misperception. Supernetting was not introduced with CIDR! It was first specified in June 1992 in RFC 1338 as a standalone strategy for improving the aggregatability of IP address blocks. The fact that I'm including it as a subtopic in a chapter on CIDR should tell you something about how pervasive this myth has become. Yet the facts remain publicly available: Supernetting was introduced 15 months before CIDR. However, CIDR made supernetting infinitely more useful simply by creating a classless IP address space. Thus, supernets could be created ...

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