Value,Description,Reference
0,NAI is absent.,[RFC9603]
1,Unassigned,
2,NAI is an IPv6 node ID.,[RFC9603]
3,Unassigned,
4,NAI is an IPv6 adjacency with global IPv6 addresses.,[RFC9603]
5,Unassigned,
6,NAI is an IPv6 adjacency with link-local IPv6 addresses.,[RFC9603]
7-15,Unassigned,