Next Protocol,Description,Reference
0x00,Reserved,[RFC9305]
0x01,IPv4,[RFC9305]
0x02,IPv6,[RFC9305]
0x03,Ethernet,[RFC9305]
0x04,NSH,[RFC9305]
0x05-0x7D,Unassigned,
0x7E-0x7F,Experimentation and testing,[RFC9305]
0x80-0xFD,Unassigned (shim headers),
0xFE-0xFF,Experimentation and testing (shim headers),[RFC9305]