Protocol Numbers

Last Updated

2024-12-06

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Registry included below

• Assigned Internet Protocol Numbers

Assigned Internet Protocol Numbers

Registration Procedure(s)

IESG Approval or Standards Action

Reference

[RFC5237][RFC7045]

Note

In the Internet Protocol version 4 (IPv4) [RFC791] there is a field
called "Protocol" to identify the next level protocol.  This is an 8
bit field.  In Internet Protocol version 6 (IPv6) [RFC8200], this field 
is called the "Next Header" field.
    

Note

Values that are also IPv6 Extension Header Types should be listed in the 
IPv6 Extension Header Types registry at [IANA registry ipv6-parameters].
    

Available Formats

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Contact Information

Footnote

Until March 2023, value 84 was also assigned to TTP (Transaction Transport Protocol).