Type Extension,Description,Reference
0,ICV of a message,[RFC7182]
1,"ICV, using a cryptographic function and a hash function, as specified in Section 12 of [RFC7182]",[RFC7182]
2,"ICV, using a cryptographic function and a hash function, and including the IP datagram source address, as specified in Section 12 of [RFC7182]",[RFC7182]
3-251,Unassigned,
252-255,Reserved for Experimental Use,[RFC7182]