| After 1912 London | 1920 Washington (Provisional) | 1927 Washington | 1932 Madrid | 1938 Cairo | 1947 Atlantic City | 1959 Geneve | 1979 Geneve | After 1979 Geneve |
| A | Germany |
|
|
|
|
AA-AL | United States |
| |
AM-AO | Spain |
| AP-AS | Pakistan |
| AT-AW | India |
| AX | Australia |
| AY-AZ | Argentina |
| B | Great Britain |
|
|
|
|
B | China |
| |
|
CA-CE | Chile |
| CB | Bolivia |
| CC | Cuba |
| |
| CE | Chile |
| |
CF-CK | Canada |
| CL-CM | Cuba |
| CN | Morocco |
CN | Morocco |
| CO-CP | Chile |
|
CO | Cuba |
| CP-CR | Portugal |
CP | Bolivia |
| CQ | Monaco |
|
CQ-CR | Portuguese colonies |
CQ-CU | Portugal |
| CR-CT | Portugal |
CR | Portuguese colonies |
| |
CS-CU | Portugal |
| |
CU-CV | Roumania |
| CV | Roumania |
CV | Roumania |
CV-CX | Uruguay |
| CW | Uruguay |
CW-CX | Uruguay |
| |
|
| |
CY-CZ | Canada |
| CZ | Monaco |
| D | Germany |
DA-DM | Germany |
D | Germany |
DA-DM | Germany |
DA-DT | Germany |
DA-DR | West Germany |
| |
DN-DQ | Belgian Congo |
| DR-DT | Belarus |
| DS-DT | South Korea |
| DU-DZ | Philippines |
| After 1912 London | 1920 Washington (Provisional) | 1927 Washington | 1932 Madrid | 1938 Cairo | 1947 Atlantic City | 1959 Geneve | 1979 Geneve | After 1979 Geneve |
| EA-EG | Spain |
EA-EH | Spain |
| |
|
|
| EI | Ireland |
EI-EJ | Ireland |
| |
|
| EK | Japan |
EK | Soviet |
EK | Armenia |
| EL | Liberia |
| |
|
EM-EO | Japan |
EM-EO | Soviet |
EM-EO | Ukraine |
| EP-EQ | Persia > Iran |
| EQ | Equador |
|
| |
|
ER | Japan |
ER | Soviet |
ER-ES | Soviet |
ER | Moldova |
| ES | Estonia |
ES | Estonia |
| ET | Ethiopia |
| |
|
EU-EY | Japan |
EU-EZ | Soviet |
EU-EW | Belarus |
| EX-EZ | Soviet |
EX | Kyrgys |
| EY | Tajikistan |
| EZ | Zaar |
EZ | Geramny |
EZ | Turkmenistan |
| F | France |
| G | Great Britain |
| HA-HF | Austria-Hungary and Bosnia-Herzegovina |
HA-HE | Austria |
HA | Hangary |
| HB | Switzerland |
| HC | Ecuador |
HC-HD | Ecuador |
| |
|
| HE | Switzerland |
| |
HF | Poland |
| HG-HH | Siam |
HG | Japan |
HG | Hungary |
| HH | Haiti |
| |
HI | Dominica |
| HJ | Columbia |
HJ-HK | Columbia |
| |
| |
|
HL-HM | Japan |
HL-HM | Chosen > South Korea |
HL | South Korea |
| HM | North Korea |
| HN | Iraq |
| HO-HP | Panama |
| HQ-HR | Honduras |
| HR | Honduras |
| HS | Siam > Thai |
| |
|
|
HT | Nicaragua |
| HU | Salvador > El Salvador |
| HV | Vatican |
| |
HW-HY | France |
| HZ | Hedjaz > Saudi Arabia |
| I | Italy |
IA-IM | Italy |
I | Italy |
| |
| J | Japan |
JA-JM | Japan |
J | Japan |
JA-JS | Japan |
| |
| JT-JV | Mongol |
| JW-JX | Norway |
| |
JY | Jordan |
| JZ | Dutch New Guinea > Indonesia |
| After 1912 London | 1920 Washington (Provisional) | 1927 Washington | 1932 Madrid | 1938 Cairo | 1947 Atlantic City | 1959 Geneve | 1979 Geneve | After 1979 Geneve |
| KA-KC | Germany |
K | United States |
| KD-KZ | United States |
| LA-LH | Norway |
LA-LM | Norway |
LA-LN | Norway |
| LI-LR | Argentine |
| |
| LO-LV | Argentine |
LO-LW | Argentine |
| LP-LQ | Argentine |
| LR | Liberia |
| |
|
| LV | Guatemara |
| LW-LX | Bulgaria |
|
| LX-LZ | Bulgaria |
LX | Luxembourg |
| LY | Hedjaz |
LY | Lithuania |
| LZ | Czechslovakia |
LZ | Bulgaria |
| M | Great Britain |
| N | United States |
| |
OA-OE | Belgium |
OA-OB | Peru |
OA-OC | Peru |
| |
| |
OD | Syrian-Lebanon > Lebanon |
| OE | Austria |
| |
OF-OH | Finland |
OF-OJ | Finland |
| OG-OM | Austria-Hungary and Bosnia-Herzegovina |
| OH | Finland |
| |
|
| OK | Czechslovakia |
OK-OM | Czechslovakia |
OK-OL | Czech |
| |
|
| OM | Slovak |
| ON-OT | Belgium |
ON-OR | Denmark |
ON-OT | Belgium |
| |
| OU-OZ | Denmark |
OU | Peru |
OU-OZ | Denmark |
| |
| PA-PI | Netherlands |
PA-PG | Brazil |
PA-PI | Netherlands |
| |
| PJA-PJM | Curacao (Dutch) |
PJ | Curacao > Dutch Antilles |
| PJN-PJZ | Surinam (Dutch) |
| PK-PM | Dutch East Indies |
PK-PO | Dutch Indies > Indonesia |
| |
| PP | Poland |
PP-PY | Brazil |
| |
| PT-PZ | Netherlands |
| PZ | Surinam |
| Q | Reserved for code abbreviations |
| R | Russia |
RA-RG | Russia |
RA-RQ | Soviet |
R | Soviet > Russia |
| |
| |
| RV | Persia |
| |
| RX | Panama |
| RY | Lithuania |
| |
| After 1912 London | 1920 Washington (Provisional) | 1927 Washington | 1932 Madrid | 1938 Cairo | 1947 Atlantic City | 1959 Geneve | 1979 Geneve | After 1979 Geneve |
| SA-SM | Sweden |
| SN-ST | Brazil |
SN | Greece |
|
|
SN-SR | Poland |
| |
SO-SR | Poland |
| SP | Panama |
SP-SR | Poland |
| |
| |
|
SS-SU | Egypt |
SSA-SSM | Egypt |
| SSN-ST | Sudan |
| ST-SU | Egypt |
| SU | Egypt |
SU | Egypt |
SU | Egypt |
| SV-SZ | Greece |
SV-SZ | Greece |
| TA-TM | Turkey |
TA-TB | Turkey |
TA-TC | Turkey |
| |
| |
|
TD | Guatemala |
| TE | Costa Rica |
| TF | Iceland |
| TG | Guatemala |
| |
|
TH | France |
| TI | Costa Rica |
| |
|
TJ-TZ | France |
TJ-TR | France |
TJ | Cameroon |
| TK-TZ | French colonies |
TK | France |
| TL | Central Africa |
| TM | France |
| |
TN | Congo |
| TO-TQ | France |
| TR | Gabon |
| TS | Saar |
TSA-TSM | Tunisia |
TS | Tunisia |
| TSN-TZ | France |
| |
TT | Chad |
| TU | Cote d'Ivoire |
| TV-TX | France |
| TY | Benan |
| TZ | Mali |
| After 1912 London | 1920 Washington (Provisional) | 1927 Washington | 1932 Madrid | 1938 Cairo | 1947 Atlantic City | 1959 Geneve | 1979 Geneve | After 1979 Geneve |
| UA-UM | France |
|
|
U | Soviet |
UA-UQ | Soviet UA-UI,UJ-UM,UN-UQ |
UA-UI | Russia |
| UH | Hedjaz |
| UI-UK | Dutch Indies |
| UJ-UM | Uzbekistan |
| UL | Luxembourg |
| |
| UN-UZ | Austria-Hungary and Bosnia-Herzegovina |
UN | Serbia, Croatia, Slovenia |
UN-UQ | Kazakhstan |
| UO | Austria |
| |
| UR-UT | Ukraine |
UR-UZ | Ukraine |
| UU-UZ | Soviet |
| VA-VG | Canada (British) |
VA-VC | Finland |
VA-VG | Canada |
| |
| VH-VK | Australian Federation (British) |
VH-VM | Australia |
VH-VN | Australia |
| VL-VM | New Zealand (British) |
| VN | South African Union (British) |
|
|
| VO | Newfoundland (British) |
VO | Newfoundland > Canada |
| VP-VS | British colonies not autonomous |
VP-VS | British colonies not autonomous > Great Britain |
VP-VQ | Great Britain |
| VR | China |
| VS | Great Britain |
| VT-VW | British India |
VT-VW | British India > India |
| |
|
VX-VY | Canada |
| |
VZ | Australia |
| W | United States |
| XA-XC | Mexico |
XA-XE | Mexico |
XA-XF | Mexico |
XA-XI | Mexico |
| |
| |
| XG-XU | China |
| XH | Honduras |
| |
| XJ-XO | Canada |
| XN | China |
| |
| XP | Denmark |
| XQ-XR | Chile |
| XS | Yugoslavia |
XS | China |
| |
XT-XW | France |
XT | France |
XT | Haute Volta > Burkina Faso |
| XU | Cambodia |
| |
|
XV-XW | Frace |
XV | Viet Nam |
| XW | Laos |
| XX | Portuguese colonies > Portugal |
| XY-XZ | British India > Burma > Myanmer |
| After 1912 London | 1920 Washington (Provisional) | 1927 Washington | 1932 Madrid | 1938 Cairo | 1947 Atlantic City | 1959 Geneve | 1979 Geneve | After 1979 Geneve |
| |
|
YA | Afganistan |
| |
YB-YH | Dutch Indies > Indonesia |
| YH | New Hebrides |
| YI | Iraq |
| |
YJ | New Hebrides > Vanuatu |
| |
YK | Soviet |
YK | Syria |
| YL | Latvia |
YL | Soviet |
YL | Latvia |
| YM | Danzig |
YM | Turkey |
| YN | Nicaragua |
| |
YO-YR | Romania |
| YS | Salvador > El Salvador |
| |
YT-YU | Yugoslavia |
| YV | Venezuela |
YV-YW | Venezuela |
YV-YY | Venezuela |
| |
| |
YY-YZ | Soviet |
| YZ | Yugoslavia |
YZ | Serbia and Montenegro |
| |
Z | Great Britain |
ZA | Albania |
| |
ZB-ZJ | British colonies > Great Britain |
| ZK-ZM | New Zealand |
| |
|
ZN-ZO | British colonies > Great Britain |
| ZP | Paraguay |
| |
|
ZQ | British colonies > Great Britain |
| ZR-ZU | South Africa |
| ZS-ZU | South Africa |
| |
|
ZV-ZZ | Brazil |
| After 1912 London | 1920 Washington (Provisional) | 1927 Washington | 1932 Madrid | 1938 Cairo | 1947 Atlantic City | 1959 Geneve | 1979 Geneve | After 1979 Geneve |