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Which is the main source of IP addressses?

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Ethical Hacking & CCNA Trainer

The Internet Engineering Task Force is responsible for the standards and protocols used in the Internet, in large measure. Before IETF existed, the US Defense Advanced Research Projects Agency (DARPA) funded the development of the Internet. I was the lead at Stanford and Bob Kahn the lead at DARPA and...
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The Internet Engineering Task Force is responsible for the standards and protocols used in the Internet, in large measure. Before IETF existed, the US Defense Advanced Research Projects Agency (DARPA) funded the development of the Internet. I was the lead at Stanford and Bob Kahn the lead at DARPA and we developed the early 32 bit number space: split into 8 bits of "network" and 24 bits of "host". When this formulation proved inadequate, the addresses were divided into classes. Class A had 7 bits of network ID (128) and a high order bits of 0 with 24 bits of host address; Class B had 16 bits of host and 14 bits of network with high order bits 10; Class C had 24 bits of host and 21 bits of network ID with high order bits 110. Class D was for multicast with high order bits of 1110 and 28 bits of multicast address; Class E had high order bits of 1111 and 28 bits for experimental use. Later even this was modified to remove the boundaries among classes and, instead, allow arbitrary bit boundaries to define "net" and "host" - to do this a "mask" had to be associated with each network (called "autonomous system") and the masks needed to be sent around in routing updates so router tables would know for each autonomous system which part of the 32 bit addresses were for "network" and which for "host." see IP address classes read less
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