Value,Description,Reference 1,IPv4 prefix,[RFC3209] 2,IPv6 prefix,[RFC3209] 3,Label,[RFC3473] 4,Unnumbered Interface ID,[RFC3477] 5,4-byte AS number,[RFC7898][RFC7897] 6,OSPF Area ID,[RFC7898][RFC7897] 7,IS-IS Area ID,[RFC7898][RFC7897] 8-31,Unassigned (For explicit resource identification), 32,Autonomous system number,[RFC3209] 33,Explicit Exclusion Route subobject (EXRS),[RFC4874] 34,Unassigned, 35,Hop Attributes,[RFC7570] 36,SR-ERO,[RFC8664] 37,Reserved,[RFC4873] 38,IPv4 Diversity,[RFC8390] 39,IPv6 Diversity,[RFC8390] 40,SRv6-ERO (PCEP-specific),[RFC9603] 41-63,Unassigned, 64,"Path Key with 32-bit PCE ID",[RFC5520][RFC5553] 65,"Path Key with 128-bit PCE ID",[RFC5520][RFC5553]