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ICMP Types List

Article Index


 

Code Fields

Registration Procedures

IESG Approval or Standards Action

Reference

[RFC2939]

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

Reference

[RFC792]

Codes Description Reference
 0 No Code

Type 1 - Unassigned

Reference

[JPB]

Registry is empty

Type 2 - Unassigned

Reference

[JPB]

Registry is empty

Type 3 — Destination Unreachable

Reference

[RFC792]

Code 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]

Codes Description Reference
 0  No Code

Type 5 — Redirect

Reference

[RFC792]

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

Reference

[JBP]

Codes Description Reference
 0 Alternate Address for Host

Type 7 - Unassigned

Reference

[JPB]

Registry is empty

Type 8 — Echo

Reference

[RFC792]

Codes Description Reference
 0 No Code

Type 9 — Router Advertisement

Reference

[RFC1256]

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

Type 10 — Router Selection

Reference

[RFC1256]

Codes Description Reference
 0 No Code

Type 11 — Time Exceeded

Reference

[RFC792]

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

Type 12 — Parameter Problem

Reference

[RFC792]

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

Type 13 — Timestamp

Reference

[RFC792]

Codes Description Reference
0 No Code

Type 14 — Timestamp Reply

Reference

[RFC792]

Codes Description Reference
0 No Code

Type 15 — Information Request

Reference

[RFC792]

Codes Description Reference
0 No Code

Type 16 — Information Reply

Reference
[RFC792]

Codes Description Reference
0 No Code

Type 17 — Address Mask Request

Reference
[RFC950]

Codes Description Reference
0 No Code

Type 18 — Address Mask Reply

Reference
[RFC950]

Codes Description Reference
0 No Code

Type 19 — Reserved (for Security)

Reference

[Solo]

Registry is empty.

 

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