Identifier Type Code,Identifier,Reference 0x0000,"The 1-octet 'htype' followed by 'hlen' octets of 'chaddr' from a DHCPv4 client's DHCPREQUEST.",[RFC4701] 0x0001,"The data octets (i.e., the Type and Client-Identifier fields) from a DHCPv4 client's Client Identifier option.",[RFC4701] 0x0002,"The client's DUID (i.e., the data octets of a DHCPv6 client's Client Identifier option or the DUID field from a DHCPv4 client's Client Identifier option).",[RFC4701] 0x0003-0xFFFE,Unassigned,[RFC4701] 0xFFFF,Reserved,[RFC4701]