Internet Assigned Numbers Authority Internet Control Message Protocol (ICMP) Parameters Last Updated 2024-04-22 Available Formats [IMG] XML [IMG] HTML [IMG] 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 Security) • 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 • Sub-types — Class 1 — MPLS Label Stack Class • Sub-types — Class 2 — Interface Information Object • Sub-types — Class 2 — Interface Information Object — Interface Roles • Sub-types — Class 3 — Interface Identification Object • Sub-types — Class 4 — Extended Information 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 [IMG] 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 [IMG] 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 [IMG] 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 [IMG] CSV Codes Description Reference 0 No Code Type 5 — Redirect Registration Procedure(s) IESG Approval or Standards Action Reference [RFC792][RFC2780] Available Formats [IMG] 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 [IMG] 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 [IMG] CSV Codes Description Reference 0 No Code Type 9 — Router Advertisement Registration Procedure(s) IESG Approval or Standards Action Reference [RFC1256][RFC2780] Available Formats [IMG] 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 [IMG] CSV Codes Description Reference 0 No Code Type 11 — Time Exceeded Registration Procedure(s) IESG Approval or Standards Action Reference [RFC792][RFC2780] Available Formats [IMG] 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 [IMG] 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 [IMG] CSV Codes Description Reference 0 No Code Type 14 — Timestamp Reply Registration Procedure(s) IESG Approval or Standards Action Reference [RFC792][RFC2780] Available Formats [IMG] CSV Codes Description Reference 0 No Code Type 15 — Information Request (Deprecated) Reference [RFC792][RFC6918] Available Formats [IMG] CSV Codes Description Reference 0 No Code Type 16 — Information Reply (Deprecated) Reference [RFC792][RFC6918] Available Formats [IMG] CSV Codes Description Reference 0 No Code Type 17 — Address Mask Request (Deprecated) Reference [RFC950][RFC6918] Available Formats [IMG] CSV Codes Description Reference 0 No Code Type 18 — Address Mask Reply (Deprecated) Reference [RFC950][RFC6918] Available Formats [IMG] 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 [IMG] 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 [IMG] 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 [IMG] 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 [IMG] 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 [IMG] 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 [IMG] 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 [IMG] 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 [IMG] 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 [IMG] 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. Licensing Terms