Value,TS Role,Reference
0,Reserved,[RFC6043]
1,Time of issue (TRi),[RFC6043]
2,Start of validity period (TRs),[RFC6043]
3,End of validity period (TRe),[RFC6043]
4,Rekeying interval (TRr),[RFC6043]
5-239,Unassigned,
240-254,Reserved for Private Use,[RFC6043]
255,Reserved,[RFC6043]