Type,Description,Reference
1,Source Link-layer Address,[RFC4861]
2,Target Link-layer Address,[RFC4861]
3,Prefix Information,[RFC4861]
4,Redirected Header,[RFC4861]
5,MTU,[RFC4861]
6,NBMA Shortcut Limit Option,[RFC2491]
7,Advertisement Interval Option,[RFC6275]
8,Home Agent Information Option,[RFC6275]
9,Source Address List,[RFC3122]
10,Target Address List,[RFC3122]
11,CGA option,[RFC3971]
12,RSA Signature option,[RFC3971]
13,Timestamp option,[RFC3971]
14,Nonce option,[RFC3971]
15,Trust Anchor option,[RFC3971]
16,Certificate option,[RFC3971]
17,IP Address/Prefix Option,[RFC5568]
18,New Router Prefix Information Option,[RFC4068]
19,Link-layer Address Option,[RFC5568]
20,"Neighbor Advertisement Acknowledgment   
Option",[RFC5568]
21,PvD ID Router Advertisement Option,[RFC8801]
22,Unassigned,
23,MAP Option,[RFC4140]
24,Route Information Option,[RFC4191]
25,Recursive DNS Server Option,[RFC5006][RFC8106]
26,RA Flags Extension Option,[RFC5175]
27,Handover Key Request Option,[RFC5269]
28,Handover Key Reply Option,[RFC5269]
29,Handover Assist Information Option,[RFC5271]
30,Mobile Node Identifier Option,[RFC5271]
31,DNS Search List Option,[RFC8106]
32,Proxy Signature (PS),[RFC6496]
33,Address Registration Option,[RFC6775]
34,6LoWPAN Context Option,[RFC6775]
35,Authoritative Border Router Option,[RFC6775]
36,6LoWPAN Capability Indication Option (6CIO),[RFC7400]
37,DHCP Captive-Portal,[RFC8910]
38,PREF64 option,[RFC8781]
39,Crypto-ID Parameters Option (CIPO),[RFC8928]
40,NDP Signature Option (NDPSO),[RFC8928]
41,Resource Directory Address Option,[RFC9176]
42,Consistent Uptime Option,[RFC9685]
43-137,Unassigned,
138,CARD Request option,[RFC4065]
139,CARD Reply option,[RFC4065]
140-143,Unassigned,
144,Encrypted DNS Option,[RFC9463]
145-252,Unassigned,
253,RFC3692-style Experiment 1 [1],[RFC4727]
254,RFC3692-style Experiment 2 [1],[RFC4727]