RFC 8200 · July 2017 · S. Deering, R. Hinden
Internet Protocol, Version 6 (IPv6) Specification
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RFC 8200 §3 IPv6 Header Format
Version · 4 bits
The Internet Protocol version number. For IPv6 it is 6.
Version 4-bit Internet Protocol version number = 6.
Not shown: Extension headers and their order (§4, §4.1): Hop-by-Hop Options, Routing, Fragment, Destination Options; Option encoding inside Hop-by-Hop and Destination Options headers (§4.2); Fragmentation and reassembly (§4.5); Packet size and the 1280-octet minimum MTU (§5); Upper-layer checksums and the pseudo-header (§8.1); Detailed Flow Label and Traffic Class semantics, defined in RFC 6437, RFC 2474 and RFC 3168.
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