Internet Assigned Numbers Authority

Internet Protocol Version 6 (IPv6) Parameters

Last Updated
2023-11-13
Available Formats

XML

HTML

Plain text

Registries included below

Next Header Types

Reference
[RFC8200][RFC2780][RFC7045]
Note
This registry has been closed in favor of the IPv6 Extension Header Types 
registry, also located at [IANA registry ipv6-parameters].
    

IPv6 Extension Header Types

Registration Procedure(s)
Standards Action or IESG Approval
Reference
[RFC2780][RFC5237][RFC7045]
Note
The "IPv6 Extension Header" field in the Assigned Internet Protocol Numbers 
registry at [IANA registry protocol-numbers] should be updated for any 
Protocol Number added to this registry.
    
Available Formats

CSV
Protocol Number Description Reference
0 IPv6 Hop-by-Hop Option [RFC8200]
43 Routing Header for IPv6 [RFC8200][RFC5095]
44 Fragment Header for IPv6 [RFC8200]
50 Encapsulating Security Payload [RFC4303]
51 Authentication Header [RFC4302]
60 Destination Options for IPv6 [RFC8200]
135 Mobility Header [RFC6275]
139 Host Identity Protocol [RFC7401]
140 Shim6 Protocol [RFC5533]
253 Use for experimentation and testing [RFC3692][RFC4727]
254 Use for experimentation and testing [RFC3692][RFC4727]

Destination Options and Hop-by-Hop Options

Registration Procedure(s)
IESG Approval, IETF Review or Standards Action
Reference
[RFC8200][RFC2780]
Note
From [RFC8200] IPv6 Option Types are 8-bit values, 
structured as three subfields, are defined in Section 4.2 of 
[RFC8200].

Each distinct 8-bit Option Type identifies a different option, i.e., the
high-order 3 bits are considered part of the option identification.
However, it is recommended that Option Types be assigned with distinct
values in the "rest" subfield, until and unless that 5-bit space becomes
full.
    
Available Formats

CSV
Hex Value Binary Value Description Reference
act chg rest
0x00 00 0 00000 Pad1 [RFC2460]
0x01 00 0 00001 PadN [RFC2460]
0xC2 11 0 00010 Jumbo Payload [RFC2675]
0x23 00 1 00011 RPL Option [RFC9008]
0x63 01 1 00011 RPL Option (DEPRECATED) [RFC6553][RFC9008]
0x04 00 0 00100 Tunnel Encapsulation Limit [RFC2473]
0x05 00 0 00101 Router Alert [RFC2711]
0x26 00 1 00110 Quick-Start [RFC4782][RFC Errata 2034]
0x07 00 0 00111 CALIPSO [RFC5570]
0x08 00 0 01000 SMF_DPD [RFC6621]
0xC9 11 0 01001 Home Address [RFC6275]
0x8A 10 0 01010 Endpoint Identification (DEPRECATED) [[CHARLES LYNN]]
0x8B 10 0 01011 ILNP Nonce [RFC6744]
0x8C 10 0 01100 Line-Identification Option [RFC6788]
0x4D 01 0 01101 Deprecated [RFC7731]
0x6D 01 1 01101 MPL Option [RFC7731]
0xEE 11 1 01110 IP_DFF [RFC6971]
0x0F 00 0 01111 Performance and Diagnostic Metrics (PDM) [RFC8250]
0x30 00 1 10000 Minimum Path MTU Hop-by-Hop Option [RFC9268]
0x11 00 0 10001 IOAM Destination Option and IOAM Hop-by-Hop Option [RFC9486]
0x31 00 1 10001 IOAM Destination Option and IOAM Hop-by-Hop Option [RFC9486]
0x12 00 0 10010 AltMark [RFC9343]
10011-11101 Unassigned
0x1E 00 0 11110 RFC3692-style Experiment [1] [RFC4727]
0x3E 00 1 11110 RFC3692-style Experiment [1] [RFC4727]
0x5E 01 0 11110 RFC3692-style Experiment [1] [RFC4727]
0x7E 01 1 11110 RFC3692-style Experiment [1] [RFC4727]
0x9E 10 0 11110 RFC3692-style Experiment [1] [RFC4727]
0xBE 10 1 11110 RFC3692-style Experiment [1] [RFC4727]
0xDE 11 0 11110 RFC3692-style Experiment [1] [RFC4727]
0xFE 11 1 11110 RFC3692-style Experiment [1] [RFC4727]
11111 Unassigned

Routing Types

Registration Procedure(s)
IETF Review or IESG Approval
Reference
[RFC8200][RFC5871]
Note
For Traffic Class related information, please see [RFC2474],[RFC3168],
and [https://www.iana.org/assignments/dscp-registry].

For IPv6 Router Alert Option Values, please see:
      
[https://www.iana.org/assignments/ipv6-routeralert-values]
    
Available Formats

CSV
Value Description Reference
0 Source Route (DEPRECATED) [RFC2460][RFC5095]
1 Nimrod (DEPRECATED 2009-05-06)
2 Type 2 Routing Header [RFC6275]
3 RPL Source Route Header [RFC6554]
4 Segment Routing Header (SRH) [RFC8754]
5 CRH-16 (TEMPORARY - registered 2021-06-07, extension registered 2023-06-08, expires 2024-06-07) [draft-bonica-6man-comp-rtg-hdr-30]
6 CRH-32 (TEMPORARY - registered 2021-06-07, extension registered 2023-06-08, expires 2024-06-07) [draft-bonica-6man-comp-rtg-hdr-30]
7-252 Unassigned
253 RFC3692-style Experiment 1 [2] [RFC4727]
254 RFC3692-style Experiment 2 [2] [RFC4727]
255 Reserved

RPL-option-TLV

Registration Procedure(s)
IETF Review
Reference
[RFC6553]
Available Formats

CSV
Value Description Reference
0-254 Unassigned
255 Reserved [RFC6553]

TaggerId Types

Registration Procedure(s)
IETF Review
Reference
[RFC6621]
Available Formats

CSV
Type Mnemonic Description Reference
0 NULL No TaggerId field is present [RFC6621]
1 DEFAULT A TaggerId of non-specific context is present [RFC6621]
2 IPv4 A TaggerId representing an IPv4 address is present [RFC6621]
3 IPv6 A TaggerId representing an IPv6 address is present [RFC6621]
4-7 Unassigned

Segment Routing Header Flags

Registration Procedure(s)
IETF Review
Reference
[RFC8754]
Available Formats

CSV
Bit Description Reference
0-1 Unassigned
2 O-flag [RFC9259]
3-7 Unassigned

Segment Routing Header TLVs

Registration Procedure(s)
IETF Review
Reference
[RFC8754][RFC Errata 7081]
Note
0-127: TLVs that do not change en route. 
128-255: TLVs that may change en route.
    
Available Formats

CSV
Value Description Reference
0 Pad1 TLV [RFC8754]
1 Reserved [RFC8754]
2 Reserved [RFC8754]
3 Reserved [RFC8754]
4 PadN TLV [RFC8754]
5 HMAC TLV [RFC8754]
6 Reserved [RFC8754]
7-123 Unassigned
124-126 Experimentation and Test [RFC8754]
127 Reserved [RFC8754]
128-251 Unassigned
252-254 Experimentation and Test [RFC8754]
255 Reserved [RFC8754]

Footnotes

[1]
It is only appropriate to use these values in explicitly-configured experiments;
they MUST NOT be shipped as defaults in implementations.  See [RFC3692] for details.
[2]
It is only appropriate to use these values in explicitly-configured
experiments; they MUST NOT be shipped as defaults in implementations.
See [RFC3692] for details.