Instead of being limited to network identifiers (or "prefixes") of 8, 16 or 24 bits, CIDR currently uses prefixes anywhere from 0 to 32 bits (currently in use 13 to 27 bits). Plus over 2 million Class C networks that could include up to 254 hosts each Proposed Solution:ĬIDR is a replacement for the old process of assigning Class A, B and C addresses with a generalized network "prefix". Plus 65,000 Class B networks that could include up to 65,534 hosts each Using the old Class A, B, and C addressing scheme the Internet could support the following:ġ26 Class A networks that could include up to 16,777,214 hosts each Another way the old Class A, B, and C addresses were identified was by looking at the first 8 bits of the address and converting it to its decimal equivalent. Each address had two parts: one part to identify a unique network and the second part to identify a unique host in that network. "classes" of addresses: Class A, Class B and Class C were the most common. There is a maximum number of networks and hosts that can be assigned unique addresses using the IPv4 32-bit long addresses.
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