Class Value,Class Name,Reference
1,MPLS Label Stack Class,[RFC4950]
2,Interface Information Object,[RFC5837]
3,Interface Identification Object,[RFC8335]
4,Extended Information,[RFC8883]
5,Node Identification Object,[draft-fenner-intarea-extended-icmp-hostid-01]
6-246,Unassigned,
247-255,Reserved for Private Use,[RFC4884]