ISO 3166-2:HM

ISO 3166-2:HM is the entry for Heard [Island and McDonald Islands] in ISO 3166-2, part of the ISO 3166 standard published by the International [Organization for Standardization], which defines codes for the names of the principal subdivisions of all countries coded in ISO 3166-1.
Currently no ISO 3166-2 codes are defined in the entry for Heard Island and McDonald Islands. The territory has no defined subdivisions.
Heard Island and McDonald Islands is officially assigned the ISO [3166-1 alpha-2] code.