| Regn Prefix |
Old Prefix |
Country Name |
Period |
Remarks |
| A- | | Austria | 1929-1939 | Changed to OE- |
| AN- | | Nicaragua | 1936- | Changed to YN- |
| BR- | | Burundi | 1962-1965 | Changed to 9U- |
| C- | | Colombia | 1929-1946 | Changed to HK- |
| CB- | | Bolivia | 1929-1954 | Changed to CP- |
| CCCP- | | Soviet Union | 1929- | Changed to RA- |
| CF- | | Canada | 1929-1974 | Changed to C- |
| CH- | | Switzerland | 1929-1936 | Changed to HB- |
| CR-A | | Mozambique | 1929-1975 | Changed to C9- |
| CR-B | | Mozambique | 1971-1975 | Changed to C9- |
| CR-C | | Cape Verde Islands | 1929- | Changed to D4- |
| CR-G | | Portuguese Guinea / Guinea Bissau | 1929-1975 | Changed to J5- |
| CR-I | | Portuguese India | 1929-1961 | Changed to VT- |
| CR-L | | Angola | 1929-1975 | Changed to D2- |
| CR-M | | Macau | | Changed to CS-M |
| CR-S | | Sao Tome and Principe | 1929- | Changed to S9- |
| CR-T | | Timor | 1929-1975 | Changed to PK- |
| CS-M | CR-M | Macau | -1999 | Changed to B-M w.e.f. 20/12/1999. |
| CV- | | Romania | 1929-1936 | Changed to YR- |
| CY- | VP-C | Ceylon | 1948-1954 | Changed to 4R- |
| CZ | | Monaco | 1929-1949 | Changed to MC- |
| DDR- | | East Germany | 1945-1956 | Changed to DM- |
| DM- | | East Germany | 1956- | Changed to D- |
| ES- | | Estonia | 1929-1939 | Merged into Soviet Union CCCP- |
| EZ- | | Saar Territory | 1929-1933 | Changed to SL- |
| FC- | | Free French | 1940-1944 | Changed to F- |
| F-D | | French Morocco | 1929-1952 | Changed to CN- |
| F-KH | | Cambodia | 1945-1954 | Changed to XU- |
| F-L | | Laos | 1945-1954 | Changed to XW- |
| F-O | | Dahomey / Benin | 1929-1960 | Changed to TY- |
| F-O | | Algeria | 1929-1962 | Changed to 7T- |
| F-O | | Cameroon | 1929-1960 | Changed to TJ- |
| F-O | | Congo | 1929-1960 | Changed to TN- |
| F-O | | Gabon | 1929-1960 | Changed to TR- |
| F-O | | Guinea | 1929-1958 | Changed to 3X- |
| F-O | | Cote D'Ivoire | 1929-1960 | Changed to TU- |
| F-O | | Madagascar | 1929-1960 | Changed to 5R- |
| F-O | | Mali | 1929-1960 | Changed to TZ- |
| F-O | | Mauritania | 1929-1960 | Changed to 5T- |
| F-O | | Niger | 1929-1960 | Changed to 5U- |
| F-O | | Senegal | 1929-1960 | Changed to 6V- |
| F-O | | Ubangi-Shari | 1929-1960 | Changed to TL- |
| F-O | | Upper Volta | 1929-1960 | Changed to XT- |
| F-O | | Chad | 1929-1960 | Changed to TT- |
| F-O | | Tunisia | 1929-1956 | Changed to TS- |
| F-VN | | French Indochina (Vietnam) | 1929-1954 | Changed to XV- |
| J | | Japan | 1929-1945 | |
| JZ- | | Dutch East Indies | 1945- | |
| K- | | Kuwait | 1967-1968 | Interim - Changed to 9K- |
| KA- | | Katanga | 1961-1963 | Unoffical - Changed to 9O- |
| K-S | | Finland | 1919-1931 | Changed to OH- |
| KW- | | Cambodia | 1954 | Changed to XU- |
| LG- | | Guatemala | 1936-1948 | Changed to TG |
| LI- | | Liberia | 1929-1952 | Changed to EL- |
| LR- | | Lebanon | 1944-1954 | Changed to OD- |
| LY- | | Lithuania | 1929-1939 | Merged into Soviet Union CCCP- |
| M- | | Spain | 1929-1933 | Changed to EC- |
| MC- | | Monaco | 1949-1959 | Changed to 3A- |
| OA- | | Peru | 1929-1950 | Changed to OB- |
| OK- | | Czechoslovakia | 1929-1993 | Spilt into OK- and OM- w.e.f. 01/01/1993. |
| OO-C | | Belgium Congo | 1929-1960 | Changed to 9O- |
| PI- | | Philippines | 1941-1975 | Changed to RP- |
| R- | | Panama (two digits) | 1929-1943 | Changed to RX- |
| R- | | Argentina (thre digits) | 1929-1932 | Changed to LV- |
| RV- | | Persia (Iran) | 1929-1944 | Changed to EP- |
| RX- | | Panama | 1943-1952 | Changed to HP- |
| RY- | | Lithuania | 1929-1939 | Merged into Soviet Union CCCP- |
| SL- | EZ- | Saar Territory | 1947-1959 | Changed to D- |
| SN- | | Sudan | 1929-1959 | Changed to ST- |
| T9- | YU- | Bosnia Hercegovina | | |
| TJ- | | Transjordania | 1946-1954 | Changed to JY- |
| TS- | | Saar Territory | 1930-1931 | Unoffical - Changed to EZ- |
| UH- | | Saudi Arabia | 1945 | Interim - Changed to HZ- |
| UL- | | Luxembourg | 1929-1939 | Changed to LX- |
| UN- | | Yugoslavia | 1929-1935 | Changed to YU- |
| VO- | | Newfoundland | 1929-1939 | Merged into Canada CF- |
| VP-A | | Gold Coast (Ghana) | 1929-1957 | Changed to 9G- |
| VP-B | | Bahamas | 1929-1975 | Changed to C6- |
| VP-C | | Ceylon | 1929-1948 | Changed to CY- |
| VP-G | | British Guiana | 1929-1967 | Changed to 8R- |
| VP-H | | British Honduras (Belize) | 1947- | Changed to V3- |
| VP-J | | Jamaica | 1930-1964 | Changed to 6Y- |
| VP-K | | Kenya | 1929-1963 | Changed to 5Y- |
| VP-L | | Leeward and Windward Islands | 1929 | Now Antigua V2- |
| VP-LKA-LLZ | | St. Kitts and Nevis | | Changed to V4- |
| VP-M | | Malta | 1929-1968 | Changed to 9H- |
| VP-N | | Nyasaland | 1929-1953 | Changed to VP-Y |
| VP-P | | Western Pacific Islands | 1929- | Now Solomon Islands H4- |
| VP-R | | Northern Rhodesia | 1929-1953 | Changed to VP-Y |
| VP-S | | Somliland | 1929-1960 | Changes to 6OS- |
| VP-T | | Trinidad and Tobago | 1931-1965 | Changed to 9Y- |
| VP-U | | Uganda | 1929-1962 | Changed to 5X- |
| VP-V | | St. Vincent and Grenadines | 1959- | Changed to J8- |
| VP-W | | China (Wei-Hai-Wei) | 1929-1939 | |
| VP-W | | Rhodesia | 1971- | Changed to Z- |
| VP-X | | Gambia | 1929-1945 | |
| VP-Y | | Southern Rhodesia, Rhodesia, Nyasaland | 1929-1964 | Changed to 7Q-, 9J- |
| VP-Z | | Zanzibar | 1929-1964 | Changed to 5H- |
| VQ-B | | Barbados | 1952-1968 | Changed to 8P- |
| VQ-C | | Cyprus | 1952-1960 | Changed to 5B- |
| VQ-F | | Fiji / Tonga / Friendly | 1929-1971 | Changed to DQ- |
| VQ-G | | Grenada | 1962- | Changed to J3- |
| VQ-L | | St. Lucia | 1965- | Changed to VQ-L |
| VQ-M | | Mauritius | 1929-1968 | Changed to 3B- |
| VQ-P | | Palestine | 1930-1948 | Changed to either TJ- or 4X- |
| VQ-S | | Seychelles | 1929-1977 | Changed to S7- |
| VQ-ZA, -ZD | | Basutoland | 1929-1967 | Changed to 7P- |
| VQ-ZE, -ZH | | Bechuanaland | 1929-1968 | Changed to A2- |
| VQ-ZI | | Swaziland | 1929-1975 | Changed to 3D- |
| VR-A | | Aden | 1939 | |
| VR-B | | Bermuda | 1931- | Changed to VP-B |
| VR-C | | Caymen Islands | 1968- | Changed to VP-C |
| VR-G | | Gibraltar | 1929-1939 | Changed to G- |
| VR-H | | Hong Kong | 1929- | Changed to B-H |
| VR-J | | Johore | 1929-1963 | Changed to 9M- |
| VR-L | | Sierra Leone | 1929-1961 | Changed to 9L- |
| VR-N | | British Cameroons | 1929-1958 | Changed to either TJ- or 5N- |
| VR-O | | Sabah (North Borneo) | 1929-1963 | Changed to 9M- |
| VR-R | | Malaya | 1929-1963 | Changed to 9M- |
| VR-S | | Singapore | 1929-1965 | Changed to 9V- |
| VR-U | | Brunei | 1929- | Changed to V8- |
| VR-W | | Sarawak | 1929- | |
| XH- | | Honduras | 1929-1960 | Changed to HR- |
| XT- | | China | 1929-1949 | |
| XU- | F-KH, KW- | Kampuchea | 1954-1979 | |
| XV- | 3W- | South Vietnam | 1959-1975 | |
| XW- | | Laos | 1954- | Changed to RDPL- |
| YE- | | Yemen | 1955-1969 | Changed to 4W- |
| YL- | | Latvia | 1929-1939 | Merged in Soviet Union CCCP- |
| YM- | | Danzig Free State | 1929-1939 | Changed to D- |
| YN- | | Nicaragua | 1929-1936 | Changed to AN- |
| ZM- | | New Zealand | 1929-1939 | |
| 3W- | | Vietnam | 1954-1959 | Interim - Changed to XV- |
| 4W- | | Yemen | 1969- | Merged into 7O- |
| 6OS- | | Somalia | 1960-1969 | Changed to 6O- |
| 9O- | | Zaire | 1960-1966 | Changed to 9Q- |