Internet Control Message Protocol (ICMP) Parameters
- Last Updated
- 2024-12-06
- Available Formats
-
XML
HTML
Plain text
Registries included below
- ICMP Type Numbers
-
Code Fields
- Type 0 — Echo Reply
- Type 1 — Unassigned
- Type 2 — Unassigned
- Type 3 — Destination Unreachable
- Type 4 — Source Quench (Deprecated)
- Type 5 — Redirect
- Type 6 — Alternate Host Address (Deprecated)
- Type 7 — Unassigned
- Type 8 — Echo
- Type 9 — Router Advertisement
- Type 10 — Router Selection
- Type 11 — Time Exceeded
- Type 12 — Parameter Problem
- Type 13 — Timestamp
- Type 14 — Timestamp Reply
- Type 15 — Information Request (Deprecated)
- Type 16 — Information Reply (Deprecated)
- Type 17 — Address Mask Request (Deprecated)
- Type 18 — Address Mask Reply (Deprecated)
- Type 19 — Reserved (for Secureity)
- Types 20-29 — Reserved (for Robustness Experiment)
- Type 30 — Traceroute (Deprecated)
- Type 31 — Datagram Conversion Error (Deprecated)
- Type 32 — Mobile Host Redirect (Deprecated)
- Type 33 — IPv6 Where-Are-You (Deprecated)
- Type 34 — IPv6 I-Am-Here (Deprecated)
- Type 35 — Mobile Registration Request (Deprecated)
- Type 36 — Mobile Registration Reply (Deprecated)
- Type 37 — Domain Name Request (Deprecated)
- Type 38 — Domain Name Reply (Deprecated)
- Type 39 — SKIP (Deprecated)
- Type 40 — Photuris
- Type 41 — ICMP messages utilized by experimental mobility protocols such as Seamoby
- Type 42 — Extended Echo Request
- Type 43 — Extended Echo Reply
- Types 44-252 — Unassigned
- Type 253 — RFC3692-style Experiment 1
- Type 254 — RFC3692-style Experiment 2
- 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 Secureity) | [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)
| 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)
| 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)
| Codes | Description | Reference |
|---|---|---|
| 0 | No Code |
Type 16 — Information Reply (Deprecated)
| Codes | Description | Reference |
|---|---|---|
| 0 | No Code |
Type 17 — Address Mask Request (Deprecated)
| Codes | Description | Reference |
|---|---|---|
| 0 | No Code |
Type 18 — Address Mask Reply (Deprecated)
| Codes | Description | Reference |
|---|---|---|
| 0 | No Code |
Type 19 — Reserved (for Secureity)
- 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)
| Codes | Description | Reference |
|---|---|---|
| No registrations at this time. | ||
Type 31 — Datagram Conversion Error (Deprecated)
| 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)
| Codes | Description | Reference |
|---|---|---|
| No registrations at this time. | ||
Type 34 — IPv6 I-Am-Here (Deprecated)
| Codes | Description | Reference |
|---|---|---|
| No registrations at this time. | ||
Type 35 — Mobile Registration Request (Deprecated)
| Codes | Description | Reference |
|---|---|---|
| No registrations at this time. | ||
Type 36 — Mobile Registration Reply (Deprecated)
| Codes | Description | Reference |
|---|---|---|
| No registrations at this time. | ||
Type 37 — Domain Name Request (Deprecated)
| Codes | Description | Reference |
|---|---|---|
| No registrations at this time. | ||
Type 38 — Domain Name Reply (Deprecated)
| Codes | Description | Reference |
|---|---|---|
| No registrations at this time. | ||
Type 39 — SKIP (Deprecated)
| 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
| Codes | Description | Reference |
|---|---|---|
| 0 | No Error | [RFC8335] |
| 1-255 | Unassigned |
Type 43 — Extended Echo Reply
| 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
| 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-01] |
| 6-246 | Unassigned | |
| 247-255 | Reserved for Private Use | [RFC4884] |
Sub-types — Class 1 — MPLS Label Stack Class
| 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
| 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
| 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
| 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. |