ICMPv6 Types Codes

A list of ICMPv6 packet types and codes taken from RFC4443.

ICMPv6 Types and Codes

Types 0-127 are defined as error messages, but only 0-4 are currently defined in RFC4443.

TYPE  DESCRIPTION                   CODE                    
----------------------------------------------------- 
0     Reserved
----------------------------------------------------- 
1     Destination Unreachable
                                    0 - no route to destination
                                    1 - communication with destination administratively prohibited
                                    2 - beyond scope of source address
                                    3 - address unreachable
                                    4 - port unreachable
                                    5 - source address failed ingress/egress policy
                                    6 - reject route to destination
                                    7 - Error in Source Routing Header
----------------------------------------------------- 
2     Packet Too Big
                                    0 - Packet too big
----------------------------------------------------- 
3     Time Exceeded
                                    0 - hop limit exceeded in transit
                                    1 - fragment reassembly time exceeded
----------------------------------------------------- 
                                   
4     Parameter Problem 
                                    0 - erroneous header field encountered
                                    1 - unrecognized Next Header type encountered
                                    2 - unrecognized IPv6 option encountered
----------------------------------------------------- 

Types 128-255 are defined as informational messages. The most commonly used messages are listed below.

TYPE  DESCRIPTION                   CODE                    
----------------------------------------------------- 
128   Echo Request
                                    0 - echo request (IPv6 ping)
-----------------------------------------------------
129   Echo Reply
                                    0 - echo reply (IPv6 ping response)
-----------------------------------------------------
130   Multicast Listener Query
                                    0 - Multicast Listener Query
-----------------------------------------------------
131   Multicast Listener Report
                                    0 - Multicast Listener Report
-----------------------------------------------------
132   Multicast Listener Done
                                    0 - Multicast Listener Done
-----------------------------------------------------
133   Router Solicitation
                                    0 - Router Solicitation
-----------------------------------------------------
134   Router Advertisement
                                    0 - Router Advertisement
-----------------------------------------------------
135   Neighbor Solicitation
                                    0 - Neighbor Solicitation
-----------------------------------------------------
136   Neighbor Advertisement
                                    0 - Neighbor Advertisement
-----------------------------------------------------

See IANA allocated ICMPv6 codes for a complete list of ICMPv6 types and codes.

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