Code,Name,Status,Reference
0,Reserved,,
1,QUERY_BY_ADDRESS,,[RFC5007]
2,QUERY_BY_CLIENTID,,[RFC5007]
3,QUERY_BY_RELAY_ID,,[RFC5460]
4,QUERY_BY_LINK_ADDRESS,,[RFC5460]
5,QUERY_BY_REMOTE_ID,,[RFC5460]
6-255,Unassigned,,