ICMP Types and Codes

 

Type Number	Type Name	Optional Code(s)
0	Echo Reply
1	Unassigned
2	Unassigned

 

Type Number          Type Name              Optional Code(s)

 

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

3                                 Destination

Unreachable

7 Destination Host Unknown

8 Source Host Isolated

 

9 Communication with Destination Network is Administratively

Prohibited

 

10 Communication with Destination Host is Administratively Pro- hibited

 

11 Destination Network Unreachable for Type of Service

 

12 Destination Host Unreachable for Type of Service

 

13 Communication Administratively Prohibited

 

14 Host Precedence Violation

 

15 Precedence cutoff in effect

4                                 Source Quench

 

0 Redirect Datagram for the Network (or subnet)

5                                 Redirect

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

 

7                                 Unassigned

 

Type Number	Type Name	Optional Code(s)
8	Echo
9	Router Advert- isement
10	Router Selection
11	Time Exceeded	0 Time to Live exceeded in Transit
		1 Fragment Reassembly Time Exceeded
12	Parameter Problem	0 Pointer indicates the error
		1 Missing a Required Option
		2 Bad Length
13	Timestamp
14	Timestand Reply
15	Information Request
16	Information Reply
17	Address Mask Request
18	Address Mask Reply
19	Reserved (for Security)
20 – 29	Reserved (for Robustness Exper- iment)
30	Traceroute
31	Datagram Con- version Error
32	Mobile Host Redir- ect

 

Type Number	Type Name	Optional Code(s)
33	IPv6 Where-Are- You
34	IPv6 I-Am-Here
35	Mobile Registration
36	Mobile Registration Reply
37	Domain Name Request
38	Domain Name Reply
39	SKIP
40	Photuris
41 – 255	Reserved

 

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