Number,Name,Reference
0,32-bit Sequential Numbers,[RFC7296][RFC-ietf-ipsecme-ikev2-rename-esn-04]
1,Partially Transmitted 64-bit Sequential Numbers,[RFC7296][RFC-ietf-ipsecme-ikev2-rename-esn-04]
2,32-bit Unspecified Numbers,[RFC-ietf-ipsecme-g-ikev2-21]
3-1023,Unassigned,
1024-65535,Reserved for Private Use,[RFC-ietf-ipsecme-ikev2-rename-esn-04]