Bit Number,Description,Reference
0,Unassigned,
1,C-Flag,[RFC-ietf-6lo-updating-rfc-8928-05][RFC8928]
2-3,P-Field (2 bits),"[RFC9685, Section 14.1]"
4-5,I-Field (2 bits),"[RFC8505, Section 4.1]"
6,R Flag,[RFC8505]
7,T Flag,[RFC8505]