Around 1992, the IETF became aware of a global shortage of IPv4 addresses, and technical obstacles in deploying new protocols due to limitations imposed by IPv4. An IPng (IP next generation) effort was started to solve these issues. The discussion is outlined in a bunch of RFCs, starting from RFC1550. After a large amount of discussion, around 1995, IPv6 (IP version 6) was picked as the final IPng proposal. The IPv6 base specification is specified in RFC2460.
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