How can I map GeoIP Legacy’s FIPS 10-4 region codes to GeoIP2’s ISO 3166-2 subdivision codes?

We provide a CSV file which maps FIPS 10-4 region codes to their corresponding ISO 3166-2 subdivision codes. Note that codes for the US and Canada are not present since we included ISO codes for these countries in GeoIP Legacy. Also note that the CSV file may contain outdated ISO 3166-2 subdivision codes in addition to any up-to-date codes that may have replaced them. This file incorporates GeoNames geographical data, which is made available under the Creative Commons Attribution 4.0 License.