Type Value,Message,Reference
0,Reserved,[RFC5533]
1,Responder Validator,[RFC5533]
2,Locator List,[RFC5533]
3,Locator Preferences,[RFC5533]
4,CGA Parameter Data Structure,[RFC5533]
5,CGA Signature,[RFC5533]
6,ULID Pair,[RFC5533]
7,Forked Instance Identifier,[RFC5533]
8-9,Unassigned,
10,Keepalive Timeout Option,[RFC5533]
11-16383,Unassigned,
16384-32767,Reserved for Experimental Use,[RFC5533]