Have you noticed the name of this website? I think you may find it's a Pro Pilots' site with access for other aviation pro's, thus we all talk in either ICAO or IATA codes.
Suggest you go to the ICAO website
www.icao.int and buy yourself a copy of Doc 7910. Or you can got to
www.acukwik.com and order a copy of their Int'l Edition @ GBP26.50 for all ICAO/IATA locators.