Type |
Code |
Status |
Description |
0 – Echo Reply |
0 |
|
Echo reply (used to ping) |
1 and 2 |
|
unassigned |
Reserved |
3 – Destination Unreachable |
0 |
|
Destination network unreachable |
1 |
|
Destination host unreachable |
2 |
|
Destination protocol unreachable |
3 |
|
Destination port unreachable |
4 |
|
Fragmentation required, and DF flag set |
5 |
|
Source route failed |
6 |
|
Destination network unknown |
7 |
|
Destination host unknown |
8 |
|
Source host isolated |
9 |
|
Network administratively prohibited |
10 |
|
Host administratively prohibited |
11 |
|
Network unreachable for ToS |
12 |
|
Host unreachable for ToS |
13 |
|
Communication administratively prohibited |
14 |
|
Host Precedence Violation |
15 |
|
Precedence cutoff in effect |
4 – Source Quench |
0 |
deprecated |
Source quench (congestion control) |
5 – Redirect Message |
0 |
|
Redirect Datagram for the Network |
1 |
|
Redirect Datagram for the Host |
2 |
|
Redirect Datagram for the ToS & network |
3 |
|
Redirect Datagram for the ToS & host |
6 |
|
deprecated |
Alternate Host Address |
7 |
|
unassigned |
Reserved |
8 – Echo Request |
0 |
|
Echo request (used to ping) |
9 – Router Advertisement |
0 |
|
Router Advertisement |
10 – Router Solicitation |
0 |
|
Router discovery/selection/solicitation |
11 – Time Exceeded |
0 |
|
TTL expired in transit |
1 |
|
Fragment reassembly time exceeded |
12 – Parameter Problem: Bad IP header |
0 |
|
Pointer indicates the error |
1 |
|
Missing a required option |
2 |
|
Bad length |
13 – Timestamp |
0 |
|
Timestamp |
14 – Timestamp Reply |
0 |
|
Timestamp reply |
15 – Information Request |
0 |
deprecated |
Information Request |
16 – Information Reply |
0 |
deprecated |
Information Reply |
17 – Address Mask Request |
0 |
deprecated |
Address Mask Request |
18 – Address Mask Reply |
0 |
deprecated |
Address Mask Reply |
19 |
|
reserved |
Reserved for security |
20 through 29 |
|
reserved |
Reserved for robustness experiment |
30 – Traceroute |
0 |
deprecated |
Information Request |
31 |
|
deprecated |
Datagram Conversion Error |
32 |
|
deprecated |
Mobile Host Redirect |
33 |
|
deprecated |
Where-Are-You (originally meant for IPv6) |
34 |
|
deprecated |
Here-I-Am (originally meant for IPv6) |
35 |
|
deprecated |
Mobile Registration Request |
36 |
|
deprecated |
Mobile Registration Reply |
37 |
|
deprecated |
Domain Name Request |
38 |
|
deprecated |
Domain Name Reply |
39 |
|
deprecated |
SKIP Algorithm Discovery Protocol, Simple Key-Management for Internet Protocol |
40 |
|
|
Photuris, Security failures |
41 |
|
Experimental |
ICMP for experimental mobility protocols such as Seamoby [RFC4065] |
42 – Extended Echo Request |
0 |
|
Request Extended Echo (XPing – see Extended Ping (Xping)) |
43 – Extended Echo Reply |
0 |
|
No Error |
1 |
|
Malformed Query |
2 |
|
No Such Interface |
3 |
|
No Such Table Entry |
4 |
|
Multiple Interfaces Satisfy Query |
44 through 252 |
|
unassigned |
Reserved |
253 |
|
Experimental |
RFC3692-style Experiment 1 (RFC 4727) |
254 |
|
Experimental |
RFC3692-style Experiment 2 (RFC 4727) |
255 |
|
reserved |
Reserved |