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In the early phases of improvement of the Internet Protocol, system directors deciphered an IP address in two sections: system number parcel and host number segment. The most astounding request octet (most huge eight bits) in a location was assigned as the system number and the remaining bits were known as the rest field or host identifier and were utilized for host numbering inside of a system.

This early technique soon demonstrated insufficient as extra systems added to that were free of the current systems as of now assigned by a system number. In 1981, the Internet tending to detail was reexamined with the presentation of classful system architecture.

Classful system outline took into account a bigger number of individual system assignments and fine-grained subnetwork plan. The initial three bits of the most critical octet of an IP location were characterized as the class of the location. Three classes (A, B, and C) were characterized for all inclusive unicast tending to. Contingent upon the class determined, the system ID depended on octet limit portions of the whole address. Every class utilized progressively extra octets as a part of the system identifier, accordingly lessening the conceivable number of hosts in the higher request classes (B and C). The accompanying table gives an outline of this now out of date framework.