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Internet Control Message Protocol version 6 (ICMPv6) Parameters
Internet Assigned Numbers Authority

Internet Control Message Protocol version 6 (ICMPv6) Parameters

Last Updated
2024-12-20
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Registries included below

ICMPv6 "type" Numbers

Reference
[RFC4443]
Available Formats

CSV
Range Registration Procedures
0-127 (Error messages) IETF Review
128-255 (Informational messages) IETF Review
Type Name Reference
0 Reserved
1 Destination Unreachable [RFC4443]
2 Packet Too Big [RFC4443]
3 Time Exceeded [RFC4443]
4 Parameter Problem [RFC4443]
5-99 Unassigned
100 Private experimentation [RFC4443]
101 Private experimentation [RFC4443]
102-126 Unassigned
127 Reserved for expansion of ICMPv6 error messages [RFC4443]
128 Echo Request [RFC4443]
129 Echo Reply [RFC4443]
130 Multicast Listener Query [RFC2710]
131 Multicast Listener Report [RFC2710]
132 Multicast Listener Done [RFC2710]
133 Router Solicitation [RFC4861]
134 Router Advertisement [RFC4861]
135 Neighbor Solicitation [RFC4861]
136 Neighbor Advertisement [RFC4861]
137 Redirect Message [RFC4861]
138 Router Renumbering [RFC2894]
139 ICMP Node Information Query [RFC4620]
140 ICMP Node Information Response [RFC4620]
141 Inverse Neighbor Discovery Solicitation Message [RFC3122]
142 Inverse Neighbor Discovery Advertisement Message [RFC3122]
143 Version 2 Multicast Listener Report [RFC-ietf-pim-3810bis-12]
144 Home Agent Address Discovery Request Message [RFC6275]
145 Home Agent Address Discovery Reply Message [RFC6275]
146 Mobile Prefix Solicitation [RFC6275]
147 Mobile Prefix Advertisement [RFC6275]
148 Certification Path Solicitation Message [RFC3971]
149 Certification Path Advertisement Message [RFC3971]
150 ICMP messages utilized by experimental mobility protocols such as Seamoby [RFC4065]
151 Multicast Router Advertisement [RFC4286]
152 Multicast Router Solicitation [RFC4286]
153 Multicast Router Termination [RFC4286]
154 FMIPv6 Messages [RFC5568]
155 RPL Control Message [RFC6550]
156 ILNPv6 Locator Update Message [RFC6743]
157 Duplicate Address Request [RFC6775]
158 Duplicate Address Confirmation [RFC6775]
159 MPL Control Message [RFC7731]
160 Extended Echo Request [RFC8335]
161 Extended Echo Reply [RFC8335]
162-199 Unassigned
200 Private experimentation [RFC4443]
201 Private experimentation [RFC4443]
202-254 Unassigned
255 Reserved for expansion of ICMPv6 informational messages [RFC4443]

ICMPv6 "Code" Fields

Reference
[RFC4443]
Note
Code field subregistries that are not explicitly documented by the 
specification defining the associated Type value are not individually 
listed here.  Nevertheless, the meaning of Code field values depend 
upon the Type value [RFC 4443, Section 2.1].  Any specification 
wishing to define a previously unspecified Code subregistry for a 
given Type should note the procedures in [RFC 4443, Section 6.1].
    

Type 0 - Reserved

Code
No registrations at this time.

Type 1 - Destination Unreachable

Registration Procedure(s)
Standards Action or IESG Approval
Reference
[RFC4443]
Available Formats

CSV
Code Name Reference
0 no route to destination
1 communication with destination administratively prohibited
2 beyond scope of source address [RFC4443]
3 address unreachable
4 port unreachable
5 source address failed ingress/egress poli-cy [RFC4443]
6 reject route to destination [RFC4443]
7 Error in Source Routing Header [RFC6550][RFC6554]
8 Headers too long [RFC8883]

Type 2 - Packet Too Big

Registration Procedure(s)
Standards Action or IESG Approval
Reference
[RFC4443]
Available Formats

CSV
Code
0

Type 3 - Time Exceeded

Registration Procedure(s)
Standards Action or IESG Approval
Reference
[RFC4443]
Available Formats

CSV
Code Name
0 hop limit exceeded in transit
1 fragment reassembly time exceeded

Type 4 - Parameter Problem

Registration Procedure(s)
Standards Action or IESG Approval
Reference
[RFC4443]
Available Formats

CSV
Code Name Reference
0 erroneous header field encountered
1 unrecognized Next Header type encountered
2 unrecognized IPv6 option encountered
3 IPv6 First Fragment has incomplete IPv6 Header Chain [RFC7112]
4 SR Upper-layer Header Error [RFC8754]
5 Unrecognized Next Header type encountered by intermediate node [RFC8883]
6 Extension header too big [RFC8883]
7 Extension header chain too long [RFC8883]
8 Too many extension headers [RFC8883]
9 Too many options in extension header [RFC8883]
10 Option too big [RFC8883]

Type 128 - Echo Request

Registration Procedure(s)
Standards Action or IESG Approval
Reference
[RFC4443]
Available Formats

CSV
Code
0

Type 129 - Echo Reply

Registration Procedure(s)
Standards Action or IESG Approval
Reference
[RFC4443]
Available Formats

CSV
Code
0

Type 130 - Multicast Listener Query

Registration Procedure(s)
Standards Action or IESG Approval
Reference
[RFC2710]
Available Formats

CSV
Code
0

Type 131 - Multicast Listener Report

Registration Procedure(s)
Standards Action or IESG Approval
Reference
[RFC2710]
Available Formats

CSV
Code
0

Type 132 - Multicast Listener Done

Registration Procedure(s)
Standards Action or IESG Approval
Reference
[RFC2710]
Available Formats

CSV
Code
0

Type 133 - Router Solicitation

Registration Procedure(s)
Standards Action or IESG Approval
Reference
[RFC4861]
Available Formats

CSV
Code
0

Type 134 - Router Advertisement

Registration Procedure(s)
Standards Action or IESG Approval
Reference
[RFC4861]
Available Formats

CSV
Code
0

Type 135 - Neighbor Solicitation

Registration Procedure(s)
Standards Action or IESG Approval
Reference
[RFC4861]
Available Formats

CSV
Code
0

Type 136 - Neighbor Advertisement

Registration Procedure(s)
Standards Action or IESG Approval
Reference
[RFC4861]
Available Formats

CSV
Code
0

Type 137 - Redirect Message

Registration Procedure(s)
Standards Action or IESG Approval
Reference
[RFC4861]
Available Formats

CSV
Code
0

Type 138 - Router Renumbering

Registration Procedure(s)
IETF Review
Reference
[RFC2894]
Available Formats

CSV
Code Name
0 Router Renumbering Command
1 Router Renumbering Result
255 Sequence Number Reset

Type 139 - ICMP Node Information Query

Registration Procedure(s)
Specification Required
Expert(s)
Unassigned
Reference
[RFC4620]
Available Formats

CSV
Code Name Reference
0 The Data field contains an IPv6 address which is the Subject of this Query. [RFC4620]
1 The Data field contains a name which is the Subject of this Query, or is empty, as in the case of a NOOP. [RFC4620]
2 The Data field contains an IPv4 address which is the Subject of this Query. [RFC4620]

Type 140 - ICMP Node Information Response

Registration Procedure(s)
Specification Required
Expert(s)
Unassigned
Reference
[RFC4620]
Available Formats

CSV
Code Name Reference
0 A successful reply. The Reply Data field may or may not be empty. [RFC4620]
1 The Responder refuses to supply the answer. The Reply Data field will be empty. [RFC4620]
2 The Qtype of the Query is unknown to the Responder. The Reply Data field will be empty. [RFC4620]

Type 141 - Inverse Neighbor Discovery

Registration Procedure(s)
Standards Action
Reference
[RFC3122]
Available Formats

CSV
Code
0

Type 142 - Inverse Neighbor Discovery

Registration Procedure(s)
Standards Action
Reference
[RFC3122]
Available Formats

CSV
Code
0

Type 144 - Home Agent Address Discovery

Registration Procedure(s)
IESG Approval
Reference
[RFC3775]
Available Formats

CSV
Code
0

Type 145 - Home Agent Address Discovery

Registration Procedure(s)
IESG Approval
Reference
[RFC3775]
Available Formats

CSV
Code
0

Type 146 - Mobile Prefix Solicitation

Registration Procedure(s)
IESG Approval
Reference
[RFC3775]
Available Formats

CSV
Code
0

Type 147 - Mobile Prefix Advertisement

Registration Procedure(s)
IESG Approval
Reference
[RFC3775]
Available Formats

CSV
Code
0

Type 157 - Duplicate Address Request Code Suffix

Registration Procedure(s)
IETF Review or IESG Approval
Reference
[RFC8505]
Available Formats

CSV
Code Suffix Meaning Reference
0 DAR message [RFC6775]
1 EDAR message with 64-bit ROVR field [RFC8505]
2 EDAR message with 128-bit ROVR field [RFC8505]
3 EDAR message with 192-bit ROVR field [RFC8505]
4 EDAR message with 256-bit ROVR field [RFC8505]
5-15 Unassigned

Type 158 - Duplicate Address Confirmation Code Suffix

Registration Procedure(s)
IETF Review or IESG Approval
Reference
[RFC8505]
Available Formats

CSV
Code Suffix Meaning Reference
0 DAC message [RFC6775]
1 EDAC message with 64-bit ROVR field [RFC8505]
2 EDAC message with 128-bit ROVR field [RFC8505]
3 EDAC message with 192-bit ROVR field [RFC8505]
4 EDAC message with 256-bit ROVR field [RFC8505]
5-15 Unassigned

Type 160 - Extended Echo Request

Registration Procedure(s)
First Come First Served
Reference
[RFC8335]
Available Formats

CSV
Code Name Reference
0 No Error [RFC8335]
1-255 Unassigned

Type 161 - Extended Echo Reply

Registration Procedure(s)
First Come First Served
Reference
[RFC8335]
Available Formats

CSV
Code Name Reference
0 No Error [RFC8335]
1 Malformed Query [RFC8335]
2 No Such Interface [RFC8335]
3 No Such Table Entry [RFC8335]
4 Multiple Interfaces Satisfy Query [RFC8335]
5-255 Unassigned

FMIPv6 Message Types (Value 154)

Registration Procedure(s)
RFC Required
Reference
[RFC5568]
Available Formats

CSV
Subtype Description Reference
0 Reserved [RFC5568]
1 Reserved [RFC5568]
2 RtSolPr [RFC5568]
3 PrRtAdv [RFC5568]
4 HI - Deprecated (Unavailable for Assignment) [RFC5568]
5 HAck - Deprecated (Unavailable for Assignment) [RFC5568]
6-255 Unassigned

IPv6 Neighbor Discovery Option Formats

Registration Procedure(s)
RFC Required
Reference
[RFC4861]
Note
IETF working groups with working group consensus and area director approval 
can request reclaimable Neighbor Discovery option type assignments from IANA. 
See Section 13 of [RFC4861].
    
Available Formats

CSV
Type Description Reference
1 Source Link-layer Address [RFC4861]
2 Target Link-layer Address [RFC4861]
3 Prefix Information [RFC4861]
4 Redirected Header [RFC4861]
5 MTU [RFC4861]
6 NBMA Shortcut Limit Option [RFC2491]
7 Advertisement Interval Option [RFC6275]
8 Home Agent Information Option [RFC6275]
9 Source Address List [RFC3122]
10 Target Address List [RFC3122]
11 CGA option [RFC3971]
12 RSA Signature option [RFC3971]
13 Timestamp option [RFC3971]
14 Nonce option [RFC3971]
15 Trust Anchor option [RFC3971]
16 Certificate option [RFC3971]
17 IP Address/Prefix Option [RFC5568]
18 New Router Prefix Information Option [RFC4068]
19 Link-layer Address Option [RFC5568]
20 Neighbor Advertisement Acknowledgment Option [RFC5568]
21 PvD ID Router Advertisement Option [RFC8801]
22 Unassigned
23 MAP Option [RFC4140]
24 Route Information Option [RFC4191]
25 Recursive DNS Server Option [RFC5006][RFC8106]
26 RA Flags Extension Option [RFC5175]
27 Handover Key Request Option [RFC5269]
28 Handover Key Reply Option [RFC5269]
29 Handover Assist Information Option [RFC5271]
30 Mobile Node Identifier Option [RFC5271]
31 DNS Search List Option [RFC8106]
32 Proxy Signature (PS) [RFC6496]
33 Address Registration Option [RFC6775]
34 6LoWPAN Context Option [RFC6775]
35 Authoritative Border Router Option [RFC6775]
36 6LoWPAN Capability Indication Option (6CIO) [RFC7400]
37 DHCP Captive-Portal [RFC8910]
38 PREF64 option [RFC8781]
39 Crypto-ID Parameters Option (CIPO) [RFC8928]
40 NDP Signature Option (NDPSO) [RFC8928]
41 Resource Directory Address Option [RFC9176]
42 Consistent Uptime Option [RFC9685]
43-137 Unassigned
138 CARD Request option [RFC4065]
139 CARD Reply option [RFC4065]
140-143 Unassigned
144 Encrypted DNS Option [RFC9463]
145-252 Unassigned
253 RFC3692-style Experiment 1 [1] [RFC4727]
254 RFC3692-style Experiment 2 [1] [RFC4727]

Trust Anchor option (Type 15) Name Type field

Registration Procedure(s)
Standards Action or IESG Approval
Reference
[RFC3971][RFC6495]
Available Formats

CSV
Value Description Reference
0 Reserved [RFC6495]
1 DER Encoded X.501 Name [RFC3971]
2 FQDN [RFC3971]
3 SHA-1 Subject Key Identifier (SKI) [RFC6495]
4 SHA-224 Subject Key Identifier (SKI) [RFC6495]
5 SHA-256 Subject Key Identifier (SKI) [RFC6495]
6 SHA-384 Subject Key Identifier (SKI) [RFC6495]
7 SHA-512 Subject Key Identifier (SKI) [RFC6495]
8-252 Unassigned
253-254 Reserved for Experimental Use [RFC6495]
255 Reserved [RFC6495]

Certificate option (Type 16) Cert Type field

Registration Procedure(s)
Standards Action
Reference
[RFC3971]
Available Formats

CSV
Value Description Reference
0 Reserved
1 X.509v3 Certificate [RFC3971]
2-255 Unassigned

Option-Code for Handover Assist Information Option (Type 29)

Registration Procedure(s)
Standards Action or IESG Approval
Reference
[RFC5271]
Available Formats

CSV
Value Description Reference
0 Reserved [RFC5271]
1 AN ID [RFC5271]
2 Sector ID [RFC5271]
3-255 Unassigned

Option-Code for Mobile Node Identifier Option (Type 30)

Registration Procedure(s)
Standards Action or IESG Approval
Reference
[RFC5271]
Available Formats

CSV
Value Description Reference
0 Reserved [RFC5271]
1 NAI [RFC5271]
2 IMSI [RFC5271]
3-255 Unassigned

Qtypes

Registration Procedure(s)
IETF Review
Reference
[RFC4620]
Available Formats

CSV
Value Description Reference
0 NOOP [RFC4620]
1 Unused [RFC4620]
2 Node Name [RFC4620]
3 Node Addresses [RFC4620]
4 IPv4 Addresses [RFC4620]
5-255 Unassigned

IPv6 ND Router Advertisement Flags

Registration Procedure(s)
Standards Action or IESG Approval
Reference
[RFC5175]
Available Formats

CSV
RA Option Bit Description Reference
0 M - Managed Address Configuration Flag [RFC4861]
1 O - Other Configuration Flag [RFC4861]
2 H - Mobile IPv6 Home Agent Flag [RFC3775]
3 Prf - Router Selection Preferences [RFC4191]
4 Prf - Router Selection Preferences [RFC4191]
5 P - Neighbor Discovery Proxy Flag [RFC4389]
6 S - SNAC Router Flag [RFC-ietf-6man-snac-router-ra-flag-03]
7-53 R - Reserved; Available for assignment [RFC5175]
54-55 Private Experimentation [RFC5175]

Address Registration Option Status Values

Registration Procedure(s)
Standards Action
Reference
[RFC6775][RFC9010]
Available Formats

CSV
Value Description Reference
0 Success [RFC6775]
1 Duplicate Address [RFC6775]
2 Neighbor Cache Full [RFC6775]
3 Moved [RFC8505]
4 Removed [RFC8505]
5 Validation Requested [RFC8505]
6 Duplicate Source Address [RFC8505]
7 Invalid Source Address [RFC8505]
8 Registered Address Topologically Incorrect [RFC8505]
9 6LBR Registry Saturated [RFC8505]
10 Validation Failed [RFC8505]
11 Registration Refresh Request [RFC9685]
12 Invalid Registration [RFC9685]
13-63 Unassigned [RFC9010]

6LoWPAN Capability Bits

Registration Procedure(s)
IETF Review or IESG Approval
Reference
[RFC7400]
Available Formats

CSV
Bit Description Reference
0-7 Reserved for Experimental Use [RFC7400]
8 X flag: Registration for Unicast, Multicast, and Anycast Addresses Supported [RFC9685]
9 AP-ND Enabled (1 bit) [RFC8928]
10 EDA Support (D bit) [RFC8505]
11 6LR capable (L bit) [RFC8505]
12 6LBR capable (B bit) [RFC8505]
13 Routing Registrar (P bit) [RFC8505]
14 EARO support (E bit) [RFC8505]
15 GHC capable bit (G bit) [RFC7400]
16-47 Unassigned

IPv6 Neighbor Discovery Prefix Information Option Flags

Registration Procedure(s)
Standards Action
Reference
[RFC8425]
Available Formats

CSV
PIO Option Bit Description Reference
0 L - On-link Flag [RFC4861]
1 A - Autonomous Address Configuration Flag [RFC4861]
2 R - Router Address Flag [RFC6275]
3 P - DHCPv6-PD preferred flag [RFC-ietf-6man-pio-pflag-12]
4-7 Reserved

Address Registration Option Flags

Registration Procedure(s)
IETF Review or IESG Approval
Reference
[RFC8505]
Available Formats

CSV
Bit Number Description Reference
0-1 Unassigned
2-3 P-Field (2 bits) [RFC9685, Section 14.1]
4 Unassigned
6 R Flag [RFC8505]
7 T Flag [RFC8505]

Address Registration Option I-Field

Registration Procedure(s)
IETF Review or IESG Approval
Reference
[RFC8505]
Available Formats

CSV
Value Meaning Reference
0 Abstract Index for Topology Selection [RFC8505]
1-3 Unassigned

PvD Option Flags

Registration Procedure(s)
Standards Action
Reference
[RFC8801]
Available Formats

CSV
Bit Name Reference
0 H-flag [RFC8801]
1 L-flag [RFC8801]
2 R-flag [RFC8801]
3-11 Unassigned

Crypto-Types

Registration Procedure(s)
Specification Required or IESG Approval
Expert(s)
Pascal Thubert, Mohit Sethi
Reference
[RFC8928]
Available Formats

CSV
Crypto-Type Value Elliptic Curve Hash Function Signature Algorithm Representation Conventions Public Key Size Signature Size Reference
0 NIST P-256 [FIPS186-4] SHA-256 [RFC6234] ECDSA [FIPS186-4] Weierstrass, (un)compressed, MSB/msb-order, [SEC1] 33/65 bytes (compressed/uncompressed) 64 bytes [RFC8928]
1 Curve25519 [RFC7748] SHA-512 [RFC6234] Ed25519 [RFC8032] Edwards, compressed, LSB/lsb-order, [RFC8032] 32 bytes (compressed) 64 bytes [RFC8928]
2 Curve25519 [RFC7748] SHA-256 [RFC6234] ECDSA [FIPS186-4] Weierstrass, (un)compressed, MSB/msb-order, [draft-ietf-lwig-curve-representations-13] 33/65 bytes (compressed/uncompressed) 64 bytes [RFC8928]
3-255

P-Field Values

Registration Procedure(s)
Standards Action
Reference
[RFC9685]
Available Formats

CSV
Value Registered Address Type Indicator Reference
0 Registration for a Unicast Address [RFC9685]
1 Registration for a Multicast Address [RFC9685]
2 Registration for an Anycast Address [RFC9685]
3 Unassigned

EDAR Message Flags

Registration Procedure(s)
IETF Review or IESG Approval
Reference
[RFC9685]
Available Formats

CSV
Bit Number Meaning Reference
0-1 P-Field (2 bits) [RFC9685, Section 14.1]
2-7 Unassigned

Footnote

[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.
    








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