Internet Protocol Version 6
Communication protocol
Diagram of an IPv6 header
IPv6 header
PurposeInternetworking protocol
Developer(s)Internet Engineering Task Force
IntroductionDecember 1995 (1995-12)
Based onIPv4
OSI layerNetwork layer
RFC(s)2460, 8200

Internet Protocol version 6 (IPv6) is the most recent version of the Internet Protocol (IP), the communications protocol that provides an identification and location system for computers on networks and routes traffic across the Internet. IPv6 was developed by the Internet Engineering Task Force (IETF) to deal with the long-anticipated problem of IPv4 address exhaustion, and was intended to replace IPv4.[1] In December 1998, IPv6 became a Draft Standard for the IETF,[2] which subsequently ratified it as an Internet Standard on 14 July 2017.[3][4]

Devices on the Internet are assigned a unique IP address for identification and location definition. With the rapid growth of the Internet after commercialization in the 1990s, it became evident that far more addresses would be needed to connect devices than the IPv4 address space had available. By 1998, the IETF had formalized the successor protocol. IPv6 uses 128-bit addresses, theoretically allowing 2128, or approximately 3.4×1038 total addresses. The actual number is slightly smaller, as multiple ranges are reserved for special usage or completely excluded from general use. The two protocols are not designed to be interoperable, and thus direct communication between them is impossible, complicating the move to IPv6. However, several transition mechanisms have been devised to rectify this.

IPv6 provides other technical benefits in addition to a larger addressing space. In particular, it permits hierarchical address allocation methods that facilitate route aggregation across the Internet, and thus limit the expansion of routing tables. The use of multicast addressing is expanded and simplified, and provides additional optimization for the delivery of services. Device mobility, security, and configuration aspects have been considered in the design of the protocol.

IPv6 addresses are represented as eight groups of four hexadecimal digits each, separated by colons. The full representation may be shortened; for example, 2001:0db8:0000:0000:0000:8a2e:0370:7334 becomes 2001:db8::8a2e:370:7334.

  1. ^ "FAQs". New Zealand IPv6 Task Force. Archived from the original on 29 January 2019. Retrieved 26 October 2015.
  2. ^ Cite error: The named reference rfc2460 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference rfc8200 was invoked but never defined (see the help page).
  4. ^ Siddiqui, Aftab (17 July 2017). "RFC 8200 – IPv6 Has Been Standardized". Internet Society. Retrieved 25 February 2018.

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