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  • Predefined options: These are option codes 0 to 124223. They are allocated by the IANA and defined by IETF standards. The DHCP server knows these standard options, and they are predefined on the server. You cannot redefine these options or delete them from the DHCP option space.

  • Vendor-specific optionsYou can create additional option spaces to define vendor-specific options, which are encapsulated in option 43 or 125. When a DHCP client requests vendor-specific options, it makes a request using the list of requested vendor-specific options (option 43 or 125). 
  • Custom options: These are option codes 125 224 to 255254. They are not defined by IETF standards and are available for private use. You can use these option codes to provide configuration or service information that none of the predefined options provide.