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Identifying Default ICMP Types
Identifying Default ICMP Codes

ICMP Type and Code IDs

This reference provides information about default ICMP type and Code IDs.

Identifying Default ICMP Types

The following table lists the default ICMP types:

ICMP Type	Message
0	Echo reply
3	Destination unreachable
4	Source quench
5	Redirect
8	Echo
9	Router advertisement
10	Router selection
11	Time exceeded
12	Parameter problem
13	Timestamp
14	Timestamp reply
15	Information request
16	Information reply
17	Address mask request
18	Address mask reply
30	Traceroute

Identifying Default ICMP Codes

The following tables list the default ICMP codes:

Table 1: ICMP Type 3: Destination Unreachable Codes
Destination Unreachable Code	Description
0	Net is unreachable
1	Host is unreachable
2	Protocol is unreachable
3	Port is unreachable
4	Fragmentation is needed and Don't Fragment was set
5	Source route failed
6	Destination network is unknown
7	Destination host is unknown
8	Source host is isolated
9	Communication with destination network is administratively prohibited
10	Communication with destination host is administratively prohibited
11	Destination network is unreachable for type of service
12	Destination host is unreachable for type of service
13	Communication is administratively prohibited
14	Host precedence violation
15	Precedence cutoff is in effect

Table 2: ICMP Type 5: Redirect Codes
Redirect Code	Description
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

Table 3: ICMP Type 11: Time Exceeded Codes
Time Exceeded Code	Description
0	Time to Live exceeded in transit
1	Fragment reassembly time exceeded

Table 4: ICMP Type 12: Parameter Problem Codes
Parameter Problem Code	Description
0	Pointer indicates the error
1	Missing a required option
2	Bad length