Value,Message Types,Reference
1,Registration Request,[RFC5944]
2,Unassigned,
3,Registration Reply,[RFC5944]
4,Tunnel Data,[RFC3519]
5-6,Unassigned,
7,Registration Revocation,[RFC3543]
8-14,Unassigned,
15,Revocation Acknowledgment,[RFC3543]
16,Handoff Request,[RFC4881]
17,Handoff Reply,[RFC4881]
18,Regional Registration Request,[RFC4857]
19,Regional Registration Reply,[RFC4857]
20,Fast Binding Update (FBU),[RFC4988]
21,Fast Binding Acknowledgment (FBAck),[RFC4988]
22,Generic Notification,[RFC6098]
23,Generic Notification Acknowledgement,[RFC6098]
24,Home Test Init message,[RFC6521]
25,Care-of Test Init message,[RFC6521]
26,Home Test message,[RFC6521]
27,Care-of Test message,[RFC6521]
28-254,Unassigned,
255,Message for Experimental use,[RFC4064]