ISO 3166-2:IR is the entry for the Islamic Republic of Iran in ISO 3166-2, part of the ISO 3166 standard published by the International Organization for Standardization (ISO), which defines codes for the names of the principal subdivisions (e.g., provinces or states) of all countries coded in ISO 3166-1.
Currently for Iran, ISO 3166-2 codes are defined for 31 provinces.
Each code consists of two parts, separated by a hyphen. The first part is IR, the ISO 3166-1 alpha-2 code of Iran. The second part is two digits.