Internet Control Message Protocol (ICMP) Parameters

Last Updated: 2024-04-22
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Registries included below

ICMP Type Numbers
Code Fields
ICMP Extension Object Classes and Class Sub-types

ICMP Type Numbers

Registration Procedure(s)

IESG Approval or Standards Action

Reference

[RFC2780]

Note

The Internet Control Message Protocol (ICMP) has many messages that
are identified by a "type" field.

Available Formats

CSV

Type	Name	Reference
0	Echo Reply	[RFC792]
1	Unassigned
2	Unassigned
3	Destination Unreachable	[RFC792]
4	Source Quench (Deprecated)	[RFC792][RFC6633]
5	Redirect	[RFC792]
6	Alternate Host Address (Deprecated)	[RFC6918]
7	Unassigned
8	Echo	[RFC792]
9	Router Advertisement	[RFC1256]
10	Router Solicitation	[RFC1256]
11	Time Exceeded	[RFC792]
12	Parameter Problem	[RFC792]
13	Timestamp	[RFC792]
14	Timestamp Reply	[RFC792]
15	Information Request (Deprecated)	[RFC792][RFC6918]
16	Information Reply (Deprecated)	[RFC792][RFC6918]
17	Address Mask Request (Deprecated)	[RFC950][RFC6918]
18	Address Mask Reply (Deprecated)	[RFC950][RFC6918]
19	Reserved (for Security)	[Solo]
20-29	Reserved (for Robustness Experiment)	[ZSu]
30	Traceroute (Deprecated)	[RFC1393][RFC6918]
31	Datagram Conversion Error (Deprecated)	[RFC1475][RFC6918]
32	Mobile Host Redirect (Deprecated)	[David_Johnson][RFC6918]
33	IPv6 Where-Are-You (Deprecated)	[Simpson][RFC6918]
34	IPv6 I-Am-Here (Deprecated)	[Simpson][RFC6918]
35	Mobile Registration Request (Deprecated)	[Simpson][RFC6918]
36	Mobile Registration Reply (Deprecated)	[Simpson][RFC6918]
37	Domain Name Request (Deprecated)	[RFC1788][RFC6918]
38	Domain Name Reply (Deprecated)	[RFC1788][RFC6918]
39	SKIP (Deprecated)	[Markson][RFC6918]
40	Photuris	[RFC2521]
41	ICMP messages utilized by experimental mobility protocols such as Seamoby	[RFC4065]
42	Extended Echo Request	[RFC8335]
43	Extended Echo Reply	[RFC8335]
44-252	Unassigned
253	RFC3692-style Experiment 1	[RFC4727]
254	RFC3692-style Experiment 2	[RFC4727]
255	Reserved	[JBP]

Code Fields

Reference

[RFC2780]

Note

Many of these ICMP types have a "code" field.  Here we list the types
again with their assigned code fields.

Type 0 — Echo Reply

Registration Procedure(s)

IESG Approval or Standards Action

Reference

[RFC792][RFC2780]

Available Formats

CSV

Codes	Description	Reference
0	No Code

Type 1 — Unassigned

Codes	Description	Reference
No registrations at this time.

Type 2 — Unassigned

Codes	Description	Reference
No registrations at this time.

Type 3 — Destination Unreachable

Registration Procedure(s)

IESG Approval or Standards Action

Reference

[RFC792][RFC2780]

Available Formats

CSV

Codes	Description	Reference
0	Net Unreachable	[RFC792]
1	Host Unreachable	[RFC792]
2	Protocol Unreachable	[RFC792]
3	Port Unreachable	[RFC792]
4	Fragmentation Needed and Don't Fragment was Set	[RFC792]
5	Source Route Failed	[RFC792]
6	Destination Network Unknown	[RFC1122]
7	Destination Host Unknown	[RFC1122]
8	Source Host Isolated	[RFC1122]
9	Communication with Destination Network is Administratively Prohibited	[RFC1122]
10	Communication with Destination Host is Administratively Prohibited	[RFC1122]
11	Destination Network Unreachable for Type of Service	[RFC1122]
12	Destination Host Unreachable for Type of Service	[RFC1122]
13	Communication Administratively Prohibited	[RFC1812]
14	Host Precedence Violation	[RFC1812]
15	Precedence cutoff in effect	[RFC1812]

Type 4 — Source Quench (Deprecated)

Reference: [RFC792][RFC6633]
Available Formats: CSV

Codes	Description	Reference
0	No Code

Type 5 — Redirect

Registration Procedure(s)

IESG Approval or Standards Action

Reference

[RFC792][RFC2780]

Available Formats

CSV

Codes	Description	Reference
0	Redirect Datagram for the Network (or subnet)
1	Redirect Datagram for the Host
2	Redirect Datagram for the Type of Service and Network
3	Redirect Datagram for the Type of Service and Host

Type 6 — Alternate Host Address (Deprecated)

Reference: [JBP][RFC6918]
Available Formats: CSV

Codes	Description	Reference
0	Alternate Address for Host

Type 7 — Unassigned

Codes	Description	Reference
No registrations at this time.

Type 8 — Echo

Registration Procedure(s)

IESG Approval or Standards Action

Reference

[RFC792][RFC2780]

Available Formats

CSV

Codes	Description	Reference
0	No Code

Type 9 — Router Advertisement

Registration Procedure(s)

IESG Approval or Standards Action

Reference

[RFC1256][RFC2780]

Available Formats

CSV

Codes	Description	Reference
0	Normal router advertisement	[RFC3344]
16	Does not route common traffic	[RFC3344]

Type 10 — Router Selection

Registration Procedure(s)

IESG Approval or Standards Action

Reference

[RFC1256][RFC2780]

Available Formats

CSV

Codes	Description	Reference
0	No Code

Type 11 — Time Exceeded

Registration Procedure(s)

IESG Approval or Standards Action

Reference

[RFC792][RFC2780]

Available Formats

CSV

Codes	Description	Reference
0	Time to Live exceeded in Transit
1	Fragment Reassembly Time Exceeded

Type 12 — Parameter Problem

Registration Procedure(s)

IESG Approval or Standards Action

Reference

[RFC792][RFC2780]

Available Formats

CSV

Codes	Description	Reference
0	Pointer indicates the error
1	Missing a Required Option	[RFC1108]
2	Bad Length

Type 13 — Timestamp

Registration Procedure(s)

IESG Approval or Standards Action

Reference

[RFC792][RFC2780]

Available Formats

CSV

Codes	Description	Reference
0	No Code

Type 14 — Timestamp Reply

Registration Procedure(s)

IESG Approval or Standards Action

Reference

[RFC792][RFC2780]

Available Formats

CSV

Codes	Description	Reference
0	No Code

Type 15 — Information Request (Deprecated)

Reference: [RFC792][RFC6918]
Available Formats: CSV

Codes	Description	Reference
0	No Code

Type 16 — Information Reply (Deprecated)

Reference: [RFC792][RFC6918]
Available Formats: CSV

Codes	Description	Reference
0	No Code

Type 17 — Address Mask Request (Deprecated)

Reference: [RFC950][RFC6918]
Available Formats: CSV

Codes	Description	Reference
0	No Code

Type 18 — Address Mask Reply (Deprecated)

Reference: [RFC950][RFC6918]
Available Formats: CSV

Codes	Description	Reference
0	No Code

Type 19 — Reserved (for Security)

Reference: [Solo]

Codes	Description	Reference
No registrations at this time.

Types 20-29 — Reserved (for Robustness Experiment)

Reference: [ZSu]

Codes	Description	Reference
No registrations at this time.

Type 30 — Traceroute (Deprecated)

Reference: [RFC1393][RFC6918]

Codes	Description	Reference
No registrations at this time.

Type 31 — Datagram Conversion Error (Deprecated)

Reference: [RFC1475][RFC6918]

Codes	Description	Reference
No registrations at this time.

Type 32 — Mobile Host Redirect (Deprecated)

Reference: [David_Johnson][RFC6918]

Codes	Description	Reference
No registrations at this time.

Type 33 — IPv6 Where-Are-You (Deprecated)

Reference: [Simpson][RFC6918]

Codes	Description	Reference
No registrations at this time.

Type 34 — IPv6 I-Am-Here (Deprecated)

Reference: [Simpson][RFC6918]

Codes	Description	Reference
No registrations at this time.

Type 35 — Mobile Registration Request (Deprecated)

Reference: [Simpson][RFC6918]

Codes	Description	Reference
No registrations at this time.

Type 36 — Mobile Registration Reply (Deprecated)

Reference: [Simpson][RFC6918]

Codes	Description	Reference
No registrations at this time.

Type 37 — Domain Name Request (Deprecated)

Reference: [RFC1788][RFC6918]

Codes	Description	Reference
No registrations at this time.

Type 38 — Domain Name Reply (Deprecated)

Reference: [RFC1788][RFC6918]

Codes	Description	Reference
No registrations at this time.

Type 39 — SKIP (Deprecated)

Reference: [Markson][RFC6918]

Codes	Description	Reference
No registrations at this time.

Type 40 — Photuris

Registration Procedure(s)

IESG Approval or Standards Action

Reference

[RFC2521][RFC2780]

Available Formats

CSV

Codes	Description	Reference
0	Bad SPI
1	Authentication Failed
2	Decompression Failed
3	Decryption Failed
4	Need Authentication
5	Need Authorization

Type 41 — ICMP messages utilized by experimental mobility protocols such as Seamoby

Registration Procedure(s)

Specification Required or IESG Approval

Expert(s)

Unassigned

Reference

[RFC4065]

Codes	Description	Reference
No registrations at this time.

Type 42 — Extended Echo Request

Registration Procedure(s)

First Come First Served

Reference

[RFC8335]

Available Formats

CSV

Codes	Description	Reference
0	No Error	[RFC8335]
1-255	Unassigned

Type 43 — Extended Echo Reply

Registration Procedure(s)

First Come First Served

Reference

[RFC8335]

Available Formats

CSV

Codes	Description	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

Types 44-252 — Unassigned

Codes	Description	Reference
No registrations at this time.

Type 253 — RFC3692-style Experiment 1 [1]

Registration Procedure(s)

Standards Action or IESG Approval

Reference

[RFC4727]

Codes	Description	Reference
No registrations at this time.

Type 254 — RFC3692-style Experiment 2 [1]

Registration Procedure(s)

Standards Action or IESG Approval

Reference

[RFC4727]

Codes	Description	Reference
No registrations at this time.

ICMP Extension Object Classes and Class Sub-types

Reference: [RFC4884]
Available Formats: CSV

Range	Registration Procedures
0-246	First Come First Served
247-255	Private Use

Class Value	Class Name	Reference
1	MPLS Label Stack Class	[RFC4950]
2	Interface Information Object	[RFC5837]
3	Interface Identification Object	[RFC8335]
4	Extended Information	[RFC8883]
5	Node Identification Object	[draft-fenner-intarea-extended-icmp-hostid]
6-246	Unassigned
247-255	Reserved for Private Use	[RFC4884]

Sub-types — Class 1 — MPLS Label Stack Class

Registration Procedure(s)

First Come First Served

Reference

[RFC4950]

Available Formats

CSV

C-Type (Value)	Description	Reference
0	Reserved	[RFC4950]
1	Incoming MPLS Label Stack	[RFC4950]
2-246	Unassigned
247-255	Reserved for private use	[RFC4950]

Sub-types — Class 2 — Interface Information Object

Reference: [RFC5837]
Available Formats: CSV

C-Type (Value)	Description	Reference
0-1	Interface Role field	[RFC5837]
2	Unallocated - allocatable with Standards Action	[RFC5837]
3	Unallocated - allocatable with Standards Action	[RFC5837]
4	ifIndex included	[RFC5837]
5	IP Address Sub-object included	[RFC5837]
6	Name Sub-object included	[RFC5837]
7	MTU included	[RFC5837]

Sub-types — Class 2 — Interface Information Object — Interface Roles

Available Formats: CSV

Value	Description	Reference
0	Incoming IP Interface	[RFC5837]
1	Sub-IP Component of Incoming IP Interface	[RFC5837]
2	Outgoing IP Interface	[RFC5837]
3	IP Next-hop	[RFC5837]

Sub-types — Class 3 — Interface Identification Object

Registration Procedure(s)

First Come First Served

Reference

[RFC8335]

Available Formats

CSV

Codes	Description	Reference
0	Reserved	[RFC8335]
1	Identifies Interface By Name	[RFC8335]
2	Identifies Interface By Index	[RFC8335]
3	Identifies Interface By Address	[RFC8335]
4-255	Unassigned

Sub-types — Class 4 — Extended Information

Registration Procedure(s)

Standards Action

Reference

[RFC8883]

Available Formats

CSV

Value	Description	Reference
0	Reserved	[RFC8883]
1	Pointer	[RFC8883]

Contact Information

ID	Name	Contact URI	Last Updated
[JBP]	Jon Postel	mailto:postel&isi.edu	1995-09
[David_Johnson]	David Johnson
[Markson]	Tom Markson	mailto:markson&osmosys.incog.com	1995-09
[Simpson]	Bill Simpson	mailto:Bill.Simpson&um.cc.umich.edu	1995-10
[Solo]
[ZSu]	Zaw-Sing Su	mailto:ZSu&TSCA.ISTC.SRI.COM

Footnote

[1]	It is only appropriate to use these values in explicitly- configured experiments; they MUST NOT be shipped as defaults in implementations. See RFC 3692 for details.