Per RFC 2132 (DHCP Options and BOOTP Vendor Extensions):

Defining new extensions

The author of a new DHCP option will follow these steps to obtain
acceptance of the option as a part of the DHCP Internet Standard:

   1. The author devises the new option.
   2. The author requests a number for the new option from IANA by
      contacting:

      Internet Assigned Numbers Authority (IANA)
      USC/Information Sciences Institute
      4676 Admiralty Way
      Marina del Rey, California  90292-6695

      or by email as: iana@iana.org

   3. The author documents the new option, using the newly obtained
      option number, as an Internet Draft.
   4. The author submits the Internet Draft for review through the
      IETF standards process as defined in "Internet Official Protocol
      Standards" (STD 1).  The new option will be submitted for
      eventual acceptance as an Internet Standard.
   5. The new option progresses through the IETF standards process;
      the new option will be reviewed by the Dynamic Host
      Configuration Working Group (if that group still exists), or as
      an Internet Draft not submitted by an IETF working group.
   6. If the new option fails to gain acceptance as an Internet
      Standard, the assigned option number will be returned to IANA
      for reassignment.

      This procedure for defining new extensions will ensure that:

      * allocation of new option numbers is coordinated from a single
        authority,
      * new options are reviewed for technical correctness and
        appropriateness, and
      * documentation for new options is complete and published.