Appendix B: Well-known Protocol, Port, and Other Numbers 283
Table B-2 Assigned ICMP Type Numbers, Codes, Descriptions, and Associated RFCs
Type Code Name Reference
0 Alternate Address for Host
7 Unassigned
8 Echo RFC 792
9 Router Advertisement RFC 1256
10 Router Solicitation RFC 1256
11 Time Exceeded RFC 792
0 Time to Live Exceeded in Transit
1 Fragment Reassembly Time Exceeded
12 Parameter Problem RFC 792
0 Pointer Indicates the Error
1 Missing a Required Option RFC 1108
2 Bad Length
13 Timestamp RFC 792
14 Timestamp Reply RFC 792
15 Information Request RFC 792
16 Information Reply RFC 792
17 Address Mask Request RFC 950
18 Address Mask Reply RFC 950
19 Reserved (for Security)
20 to 29 Reserved (for Robustness Experiment)
30 Traceroute RFC 1393
31 Datagram Conversion Error RFC 1475
32 Mobile Host Redirect
33 IPv6 Where-Are-You
34 IPv6 I-Am-Here
35 Mobile Registration Request
36 Mobile Registration Reply
37 Domain Name Request
38 Domain Name Reply
Section B-2
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