Value,Description,Reference
0,Source Route (DEPRECATED),[RFC2460][RFC5095]
1,Nimrod (DEPRECATED 2009-05-06),
2,Type 2 Routing Header,[RFC6275]
3,RPL Source Route Header,[RFC6554]
4,Segment Routing Header (SRH),[RFC8754]
5,CRH-16,[RFC9631]
6,CRH-32,[RFC9631]
7-252,Unassigned,
253,RFC3692-style Experiment 1 [2],[RFC4727]
254,RFC3692-style Experiment 2 [2],[RFC4727]
255,Reserved,