The Internet today has become essential part of our lives serving billions of users worldwide and all this is running on Internet Protocol (IP). The current version of the Internet Protocol is IPv4 which is very old protocol, having many limitations. The biggest limitation is its 32-bit addressing space resulting in 4.3 billion IP addresses. The rapid growth of Internet, broadband, mobile subscribers and deployment of NGN technology has led to major consumption of IP addresses, and this has resulted in almost exhaustion of IPv4 addresses in India as well as worldwide.
To overcome this problem of shortage, Internet Protocol version 6 (IPv6) was developed, which improves on the addressing capacities of IPv4 by using 128 bits address instead of 32 bits, thereby practically making available an almost infinite pool of IP addresses. Also, IPv6 has various enhancements over IPv4.
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