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ICMP TYPE NUMBERS
(last updated 2001 June 29)
The Internet Control Message Protocol (ICMP) has many messages that
are identified by a "type" field.
Type Name Reference
---- ------------------------- ---------
0 Echo Reply [RFC792]
1 Unassigned [JBP]
2 Unassigned [JBP]
3 Destination Unreachable [RFC792]
4 Source Quench [RFC792]
5 Redirect [RFC792]
6 Alternate Host Address [JBP]
7 Unassigned [JBP]
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 [RFC792]
16 Information Reply [RFC792]
17 Address Mask Request [RFC950]
18 Address Mask Reply [RFC950]
19 Reserved (for Security) [Solo]
20-29 Reserved (for Robustness Experiment) [ZSu]
30 Traceroute [RFC1393]
31 Datagram Conversion Error [RFC1475]
32 Mobile Host Redirect [David Johnson]
33 IPv6 Where-Are-You [Bill Simpson]
34 IPv6 I-Am-Here [Bill Simpson]
35 Mobile Registration Request [Bill Simpson]
36 Mobile Registration Reply [Bill Simpson]
37 Domain Name Request [Simpson]
38 Domain Name Reply [Simpson]
39 SKIP [Markson]
40 Photuris [Simpson]
41-255 Reserved [JBP]
Many of these ICMP types have a "code" field. Here we list the types
again with their assigned code fields.
Type Name Reference
---- ------------------------- ---------
0 Echo Reply [RFC792]
Codes
0 No Code
1 Unassigned [JBP]
2 Unassigned [JBP]
3 Destination Unreachable [RFC792]
Codes
0 Net Unreachable
1 Host Unreachable
2 Protocol Unreachable
3 Port Unreachable
4 Fragmentation Needed and Don't Fragment was Set
5 Source Route Failed
6 Destination Network Unknown
7 Destination Host Unknown
8 Source Host Isolated
9 Communication with Destination Network is
Administratively Prohibited
10 Communication with Destination Host is
Administratively Prohibited
11 Destination Network Unreachable for Type of Service
12 Destination Host Unreachable for Type of Service
13 Communication Administratively Prohibited [RFC1812]
14 Host Precedence Violation [RFC1812]
15 Precedence cutoff in effect [RFC1812]
4 Source Quench [RFC792]
Codes
0 No Code
5 Redirect [RFC792]
Codes
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
6 Alternate Host Address [JBP]
Codes
0 Alternate Address for Host
7 Unassigned [JBP]
8 Echo [RFC792]
Codes
0 No Code
9 Router Advertisement [RFC1256]
Codes
0 Normal router advertisement
16 Does not route common traffic [RFC2002]
10 Router Selection [RFC1256]
Codes
0 No Code
11 Time Exceeded [RFC792]
Codes
0 Time to Live exceeded in Transit
1 Fragment Reassembly Time Exceeded
12 Parameter Problem [RFC792]
Codes
0 Pointer indicates the error
1 Missing a Required Option [RFC1108]
2 Bad Length
13 Timestamp [RFC792]
Codes
0 No Code
14 Timestamp Reply [RFC792]
Codes
0 No Code
15 Information Request [RFC792]
Codes
0 No Code
16 Information Reply [RFC792]
Codes
0 No Code
17 Address Mask Request [RFC950]
Codes
0 No Code
18 Address Mask Reply [RFC950]
Codes
0 No Code
19 Reserved (for Security) [Solo]
20-29 Reserved (for Robustness Experiment) [ZSu]
30 Traceroute [RFC1393]
31 Datagram Conversion Error [RFC1475]
32 Mobile Host Redirect [David Johnson]
33 IPv6 Where-Are-You [Bill Simpson]
34 IPv6 I-Am-Here [Bill Simpson]
35 Mobile Registration Request [Bill Simpson]
36 Mobile Registration Reply [Bill Simpson]
39 SKIP [Markson]
40 Photuris [Simpson]
Code
0 Reserved
1 unknown security parameters index
2 valid security parameters, but authentication failed
3 valid security parameters, but decryption failed
REFERENCES
----------
[RFC792] Postel, J., "Internet Control Message Protocol", STD 5,
RFC 792, USC/Information Sciences Institute, September 1981.
[RFC950] Mogul, J., and J. Postel, "Internet Standard Subnetting
Procedure", STD 5, RFC 950, Stanford, USC/Information
Sciences Institute, August 1985.
[RFC1108] Kent, S., "U.S. Department of Defense Security Options for
the Internet Protocol", RFC 1108, November 1991.
[RFC1256] Deering, S., Editor, "ICMP Router Discovery Messages", RFC
1256, Xerox PARC, September 1991.
[RFC1393] Malkin, G., "Traceroute Using an IP Option", RFC 1393,
Xylogics, Inc., January 1993.
[RFC1475] Ullmann, R., "TP/IX: The Next Internet", RFC 1475, Process
Software Corporation, June 1993.
[RFC1812] Baker, F., "Requirements for IP Version 4 Routers", RFC
1812, Cisco Systems, June 1995.
[RFC2002] C. Perkins, Editor, "IP Mobility Support", RFC 2002,
October 1996.
PEOPLE
------
[JBP] Jon Postel, <postel@isi.edu>, September 1995.
[David Johnson]
[Markson] Tom Markson, <markson@osmosys.incog.com>, September 1995.
[Simpson] Bill Simpson, <Bill.Simpson@um.cc.umich.edu>, October 1995.
[Solo]
[ZSu] Zaw-Sing Su <ZSu@TSCA.ISTC.SRI.COM>
[]
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