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Appendix C. Lists of Reserved Ports, ICMP Types and Codes, and Internet Protocols
ICMP type Name Code Description
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
4 Source Quench 0 No Code
5 Redirect 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 0 Alternate Address for Host
7 Unassigned
8 Echo 0 No Code
9 Router Advertisement 0 No Code
10 Router Selection 0 No Code
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 0 No Code
14 Timestamp Reply 0 No Code
15 Information Request 0 No Code
16 Information Reply 0 No Code
17 Address Mask Request 0 No Code
18 Address Mask Reply 0 No Code
19 Reserved (for Security)
20-29 Reserved (for Robustness
Experiment)
30 Traceroute
31 Datagram Conversion Error
32 Mobile Host Redirect
33 IPv6 Where-Are-You
34 IPv6 I-Am-Here
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