ISO 3166-2:IN is the entry for India 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 India, ISO 3166-2 codes are defined for 28 states and 7 Union territories.
Each code consists of two parts, separated by a hyphen. The first part is IN, the ISO 3166-1 alpha-2 code of India. The second part is two letters, currently used in vehicle registration plates, except Chhattisgarh and Uttarakhand whose vehicle codes are CG and UA/UK respectively instead of CT and UT.
Read more about ISO 3166-2:IN: Current Codes