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What is IPv4 and IPv6 -- Internet Protocol Version 4 and 6 ?

IPv4 (Internet Protocol Version 4) is the fourth revision of the Internet Protocol (IP) used to to identify devices on a network through an addressing system.

The Internet Protocol is designed for use in interconnected systems of packet-switched computer communication networks,IPv4 is the most widely deployed Internet protocol used to connect devices to the Internet.

IPv4 uses a 32-bit address scheme allowing for a total of 2^32 addresses (just over 4 billion addresses).

IPv6 (Internet Protocol Version 6) is also called IPng (Internet Protocol next generation) and it is the newest version of the Internet Protocol (IP) reviewed in the IETF standards committees to replace the current version of IPv4 (Internet Protocol Version 4).
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