Listed are the countries which, in 1931, had been given a radio call sign allocation, what that allocation was, and what that country or its successor state is currently allocated.
Alphabetical order of call signs is A B C D E F G H I J K L M N O P Q R S T U V W X Y Z 1 2 3 4 5 6 7 8 9 0
| 1931 | Today | ||
|---|---|---|---|
| Country | Allocation | Country | Allocation |
| Afghanistan | YA | Afghanistan | T6,YA |
| Albania | ZA | Albania | ZA |
| Argentine Republic | LO-LW | Argentina | AY-AZ,LO-LW,L2-L9 |
| Australia | VH-VM | Australia | AX,VH-VN,VZ |
| Austria | OE | Austria | OE |
| Belgium | ON-OT | Belgium | ON-OT |
| Bolivia | CP | Bolivia | CP |
| Brazil | PP-PY,ZV-ZZ | Brazil | PP-PY,ZV-ZZ |
| British India | VT-VW,XY-XZ | India | AT-AW,VT-VW,8T-8Y |
| Myanmar | XY-XZ | ||
| Bulgaria | LZ | Bulgaria | LZ |
| Canada | CF-CK,CY-CZ,VA-VG,VX-VY | Canada | CF-CK,CY-CZ,VA-VG,VO,VX-VY,XJ-XO |
| Chile | CA-CE | Chile | CA-CE,XQ-XR,3G |
| China | XG-XU | China | B,XS,3H-3U |
| Colombia | HJ-HK | Colombia | HJ-HK,5J-5K |
| Costa Rica | TI | Costa Rica | TE,TI |
| Cuba | CL-CM,CO | Cuba | CL-CM,CO |
| Curacao | PJ | Netherlands Antilles | PJ |
| Czechoslovakia | OK | Czech Republic | OK-OL |
| Free City of Danzig | YM | Poland | HF,SN-SR,3Z |
| Denmark | OU-OZ | Denmark | OU-OZ,XP,5P-5Q |
| Dominican Republic | HI | Dominican Republic | HI |
| Dutch East Indies | PK-PO,YB-YH | Indonesia | JZ,PK-PO,YB-YH,7A-7I,8A-8I |
| Ecuador | HC | Ecuador | HC-HD |
| Egypt | ST-SU | Egypt | SSA-SSM,SU,6A,6B |
| Sudan | SSN-SS0,ST,6T,6U | ||
| El Salvador | YS | El Salvador | HU,YS |
| Estonia | ES | Estonia | ES |
| Ethiopia | ET | Ethiopia | ET,9E-9F |
| Finland | OF-OH | Finland | OF-OJ |
| France | F | France | F,HW-HY,TH,TK,TM,TO-TQ,TV-TX |
| French Colonies | TK-TZ | Benin | TY |
| Central African Republic | TL | ||
| Chad | TT | ||
| Congo | TN | ||
| France | F,HW-HY,TH,TK,TM,TO-TQ,TV-TX | ||
| Gabon | TR | ||
| Ivory Coast | TU | ||
| Mali | TZ | ||
| Tunisia | TS,3V | ||
| Germany | D | Germany | DA-DR,Y2-Y9 |
| Great Britain | G,M,VP-VS,ZB-ZJ | Great Britain | G,M,VP-VS,ZB-ZJ,ZN-ZO,ZQ,2 |
| Greece | SV-SZ | Greece | J4,SV-SZ |
| Guatemala | TG | Guatemala | TD,TG |
| Haiti | HH | Haiti | HH,4V |
| Hedjaz | HZ | Saudi Arabia | HZ,7Z,8Z |
| Honduras | HR | Honduras | HQ-HR |
| Hungary | HA | Hungary | HA,HG |
| Iceland | TF | Iceland | TF |
| Iraq | YI | Iraq | HN,YI |
| Irish Free State | EI | Ireland | EI-EJ |
| Italy | I | Italy | I |
| Japan | J | Japan | JA-JS,7J-7N,8J-8N |
| Latvia | YL | Latvia | YL |
| Liberia | EL | Liberia | A8,D5,EL,5L-5M,6Z |
| Lithuania | LY | Lithuania | LY |
| Luxemburg | LX | Luxemburg | LX |
| Mexico | XA-XF | Mexico | XA-XI,4A-4C,6D-6J |
| Morocco | CN | Morocco | CN,5C-5G |
| Netherlands | PA-PI | Netherlands | PA-PI |
| New Hebrides | YJ | Vanuatu | YJ |
| New Zealand | ZK-ZM | New Zealand | ZK-ZM |
| Newfoundland | VO | Canada | CF-CK,CY-CZ,VA-VG,VO,VX-VY,XJ-XO |
| Nicaragua | YN | Nicaragua | HT,H6-H7,YN |
| Norway | LA-LN | Norway | JW-JX,LA-LN,3Y |
| Panama | HP | Panama | HO-HP,H3,H8-H9,3E-3F |
| Paraguay | ZP | Paraguay | ZP |
| Persia | EP-EQ | Iran | EP-EQ,9B-9D |
| Peru | OA-OC | Peru | OA-OC,4T |
| Poland | SO-SR | Poland | HF,SN-SR,3Z |
| Portugal | CS-CU | Portugal | CQ-CU |
| Portuguese Colonies | CQ-CR | Portugal | CQ-CU |
| Rumania | YO-YR | Romania | YO-YR |
| Territory of the Saar | EZ | Germany | DA-DR,Y2-Y9 |
| Siam | HS | Thailand | E2,HS |
| South Africa | ZS-ZU | South Africa | ZR-ZU,S8 |
| Spain | EA-EH | Spain | AM-AO,EA-EH |
| Surinam | PZ | Surinam | PZ |
| Sweden | SA-SM | Sweden | SA-SM,7S,8S |
| Swiss Confederation | HB | Switzerland | HB,HE |
| Turkey | TA-TC | Turkey | TA-TC,YM |
| Union of Soviet Socialist Republics | R,U | Kazakhstan | UN-UQ |
| Russian Federation | R,UA-UI | ||
| Ukraine | UR-UZ | ||
| Uzbekistan | UJ-UM | ||
| United States | K,N,W | United States | AA-AL,K,N,W |
| Uruguay | CV-CX | Uruguay | CV-CX |
| Vatican City | HV | Vatican City | HV |
| Venezuela | YV-YW | Venezuela | YV-YY,4M |
| Yugoslavia | YT-YU | Yugoslavia | YT-YU,YZ,4N-4O |