UN/LOCODE and GISIS Code finder. Port Codes have five characters. The first two letters code a country by the table defined in ISO 3166-1 alpha-2. The three remaining characters code a location within that country. Letters are preferred, but if necessary digits 2 through 9 may be used, excluding "0" and "1" to avoid confusion with the letters "O" and "I" respectively. You can find port name by site search if you have the port code.You can find more information (Position, Map, Country Flag etc.) on our website content.