Type	Code	Name	Reference
0		Echo Reply	[RFC792]
1		Unassigned	[JBP]
2		Unassigned	[JBP]
3		Destination Unreachable	[RFC792]
3	0	Net Unreachable
3	1	Host Unreachable
3	2	Protocol Unreachable
3	3	Port Unreachable
3	4	Fragmentation Needed and Don't Fragment Was Set
3	5	Source Route Failed
3	6	Destination Network Unknown
3	7	Destination Host Unknown
3	8	Source Host Isolated
3	9	Communication with Destination Network is Administratively Prohibited
3	10	Communication with Destination Host is Administratively Prohibited
3	11	Destination Network Unreachable for Type of Service
3	12	Destination Host Unreachable for Type of Service
3	13	Communication Administratively Prohibited	[RFC1812]
3	14	Host Precedence Violation	[RFC1812]
3	15	Precedence cutoff in effect	[RFC1812]
4		Source Quench	[RFC792]
4	0	Redirect Datagram for the Network (or subnet)
4	1	Redirect Datagram for the Host
4	2	Redirect Datagram for the Type of Service and Network
4	3	Redirect Datagram for the Type of Service and Host
5		Redirect	[RFC792]
6		Alternate Host Address	[JBP]
7		Unassigned	[JBP]
8		Echo	[RFC792]
9		Router Advertisement	[RFC1256]
10		Router Selection	[RFC1256]
11		Time Exceeded	[RFC792]
11	0	Time to Live exceeded in Transit
11	1	Fragment Reassembly Time Exceeded
12		Parameter Problem	[RFC792]
12	0	Pointer indicates the error
12	1	Missing a Required Option	[RFC1108]
12	2	Bad Length
13		Timestamp	[RFC792]
14		Timestamp Reply	[RFC792]
15		Information Request	[RFC792]
16		Information Reply	[RFC792]
17		Address Mask Request	[RFC950]
18		Address Mask Reply	[RFC950]
19		Reserved (for Security)	[Solo]
20		Reserved (for Robustness Experiment)	[ZSu]
21		Reserved (for Robustness Experiment)	[ZSu]
22		Reserved (for Robustness Experiment)	[ZSu]
23		Reserved (for Robustness Experiment)	[ZSu]
24		Reserved (for Robustness Experiment)	[ZSu]
25		Reserved (for Robustness Experiment)	[ZSu]
26		Reserved (for Robustness Experiment)	[ZSu]
27		Reserved (for Robustness Experiment)	[ZSu]
28		Reserved (for Robustness Experiment)	[ZSu]
29		Reserved (for Robustness Experiment)	[ZSu]
30		Traceroute	[RFC1393]
31		Datagram Conversion Error	[RFC1475]
32		Mobile Host Redirect	[David Johnson]
33		IPv6 Where-Are-You	[Bill Simpson]
34		IPv6 I-Am-Here	[Bill Simpson]
35		Mobile Registration Request	[Bill Simpson]
36		Mobile Registration Reply	[Bill Simpson]
37		Domain Name Request	[Simpson]
38		Domain Name Reply	[Simpson]
39		SKIP	[Markson]
40		Photuris	[Simpson]