Internet Assigned Numbers Authority
Internet Protocol Version 6 (IPv6) Parameters
Last Updated
2025-06-26
Available Formats
[IMG]
XML [IMG]
HTML [IMG]
Plain text
Registries Included Below
??Next Header Types
??IPv6 Extension Header Types
??Destination Options and Hop-by-Hop Options
??Routing Types
??RPL-option-TLV
??TaggerId Types
??Segment Routing Header Flags
??Segment Routing Header TLVs
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][RFC-ietf-netmod-acl-extensions-17]
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.
Note
When a new code is assigned to an IPv6 Extension Header, the next available
free bit in [IPFIX ipv6ExtensionHeaders Bits] is selected for this new
Extension Header. [IPFIX ipv6ExtensionHeaders Bits] is updated accordingly.
Modifications to existing registrations must be mirrored in
[IPFIX ipv6ExtensionHeaders Bits].
Note
When this registry is modified, the YANG module "iana-ipv6-ext-types"
[IANA registry yang-parameters] must be updated as defined in
[RFC-ietf-netmod-acl-extensions-17].
Available Formats
[IMG]
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][RFC9673]
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
[IMG]
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 (DEPRECATED for New Protocols) [RFC2711][RFC9805]
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
[IMG]
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 [RFC9631]
6 CRH-32 [RFC9631]
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
[IMG]
CSV
Value Description Reference
0-254 Unassigned
255 Reserved [RFC6553]
TaggerId Types
Registration Procedure(s)
IETF Review
Reference
[RFC6621]
Available Formats
[IMG]
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
[IMG]
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
[IMG]
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.
Licensing Terms
Presently we were in a very dark road, and at a point where it dropped suddenly between steep sides we halted in black shadow. A gleam of pale sand, a whisper of deep flowing waters, and a farther glimmer of more sands beyond them challenged our advance. We had come to a "grapevine ferry." The scow was on the other side, the water too shoal for the horses to swim, and the bottom, most likely, quicksand. Out of the blackness of the opposite shore came a soft, high-pitched, quavering, long-drawn, smothered moan of woe, the call of that snivelling little sinner the screech-owl. Ferry murmured to me to answer it and I sent the same faint horror-stricken tremolo back. Again it came to us, from not farther than one might toss his cap, and I followed Ferry down to the water's edge. The grapevine guy swayed at our side, we heard the scow slide from the sands, and in a few moments, moved by two videttes, it touched our shore. Soon we were across, the two videttes riding with us, and beyond a sharp rise, in an old opening made by the swoop of a hurricane, we entered the silent unlighted bivouac of Ferry's scouts. Ferry got down and sat on the earth talking with Quinn, while the sergeants quietly roused the sleepers to horse. Plotinus is driven by this perplexity to reconsider the whole theory of Matter.477 He takes Aristotle¡¯s doctrine as the groundwork of his investigation. According to this, all existence is divided into Matter and Form. What we know of things¡ªin other words, the sum of their differential characteristics¡ªis their Form. Take away this, and the unknowable residuum is their Matter. Again, Matter is the vague indeterminate something out of which particular Forms are developed. The two are related as Possibility to Actuality, as the more generic to the more specific substance through every grade of classification and composition. Thus there are two Matters, the one sensible and the other intelligible. The former constitutes the common substratum of bodies, the other the common element of ideas.478 The general distinction between Matter and Form was originally suggested to Aristotle by Plato¡¯s remarks on the same subject; but he differs325 from his master in two important particulars. Plato, in his Timaeus, seems to identify Matter with space.479 So far, it is a much more positive conception than the ?λη of the Metaphysics. On the other hand, he constantly opposes it to reality as something non-existent; and he at least implies that it is opposed to absolute good as a principle of absolute evil.480 Thus while the Aristotelian world is formed by the development of Power into Actuality, the Platonic world is composed by the union of Being and not-Being, of the Same and the Different, of the One and the Many, of the Limit and the Unlimited, of Good and Evil, in varying proportions with each other. The Lawton woman had heard of an officer's family at Grant, which was in need of a cook, and had gone there. [See larger version] On the 8th of July an extraordinary Privy Council was summoned. All the members, of whatever party, were desired to attend, and many were the speculations as to the object of their meeting. The general notion was that it involved the continuing or the ending of the war. It turned out to be for the announcement of the king's intended marriage. The lady selected was Charlotte, the second sister of the Duke of Mecklenburg-Strelitz. Apart from the narrowness of her education, the young princess had a considerable amount of amiability, good sense, and domestic taste. These she shared with her intended husband, and whilst they made the royal couple always retiring, at the same time they caused them to give, during their lives, a moral air to their court. On the 8th of September Charlotte arrived at St. James's, and that afternoon the marriage took place, the ceremony being performed by the Archbishop of Canterbury. On the 22nd the coronation took place with the greatest splendour. Mother and girls were inconsolable, for each had something that they were sure "Si would like," and would "do him good," but they knew Josiah Klegg, Sr., well enough to understand what was the condition when he had once made up his mind. CHAPTER V. THE YOUNG RECRUITS Si proceeded to deftly construct a litter out of the two guns, with some sticks that he cut with a knife, and bound with pawpaw strips. His voice had sunk very low, almost to sweetness. A soft flurry of pink went over her face, and her eyelids drooped. Then suddenly she braced herself, pulled herself taut, grew combative again, though her voice shook. HoME²Ô¾®Ïè̫ʲôÐÇ×ù
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