The Free On-line Dictionary of Computing (30 December 2018):

Internet Assigned Numbers Authority
IANA

    (IANA) The central registry for various
   "assigned numbers": Internet Protocol parameters, such as
   port, protocol, and enterprise numbers; and options,
   codes, and types.  The currently assigned values are listed in
   the "Assigned Numbers" document STD 2.  To request a number
   assignment, e-mail .

   (1994-12-06)