Resolution 475 (Official Bulletin 15)
| Country | Prefix | |
|---|---|---|
| Great Britain & Northern Ireland | G- | |
| Chile | CC- | |
| Monaco | CZ- | |
| Belgium | OO- | |
| Netherlands | PH- | |
| Sweden | SE- | |
| British Colonies & Protectorates | VP-, VQ- or VR- | |
| India | VT- | |
| Latvia | YL- |
Resolution 507 (Official Bulletin 17)
| Country | Prefix | |
|---|---|---|
| Colombia | HK- | |
| Peru | OB- | |
| Curacao | PJ- | |
| Netherlands East Indies | PK- | |
| Surinam | PZ- | |
| Poland | SP- | |
| Greece | SV- | |
| Turkey | TA-, TB- or TC- | |
| Luxembourg | UL- | |
| Australia | VH- | |
| Mexico | XA- or XB- | |
| China | XT- | |
| Venezuela | YV- | |
| New Zealand | ZK- | |
| Union of South Africa | ZS- |
Resolution 530 (Official Bulletin 18)
| Country | Prefix | |
|---|---|---|
| Egypt | SU- | |
| Greece | SX | |
| Turkey | TC- |
Resolution 572 (Official Bulletin 19)
| Country | Prefix | Notes |
|---|---|---|
| Canada | CF- | |
| Portugal | CS- | |
| Finland | OH- | All combinations of three letters save those containing WW |
| Denmark | OY- | |
| USSR | RA- or RO- | |
| Republic of Panama | RX- | |
| Lithuania | RY- |
Resolution 624 (Official Bulletin 20)
| Country | Prefix | Notes |
|---|---|---|
| USA | N- | Plus any combination of four letters |
| Cuba | CL- or CM- | |
| Spain | EC- | |
| Estonia | ES- | |
| Hungary | HA- | |
| Iraq | YI- | |
| Norway | LN- | All combinations of three letters except those containing Å, Æ or Ö |
Resolution 681 (Official Bulletin 21)
| Country | Prefix | Notes |
|---|---|---|
| Republic of Ecuador | HC- | |
| Brazil | PP- | |
| Albania | ZA- | |
| Persia | EP- | |
| Saar Territory | EZ- | |
| New Hebrides | YJ- | |
| Roumania | YR- | |
| Yugoslavia | YT- or YU- | (Yugoslavia to select one) |
Resolution 744 (Official Bulletin 22)
| Country | Prefix | |
|---|---|---|
| Yugoslavia | YU- |
Resolution 809 (Official Bulletin 23)
| Country | Prefix | Notes |
|---|---|---|
| Germany | D- | Plus any combination of four letters |
| Switzerland | HB- | |
| Luxembourg | LX- | |
| Costa Rica | TI- |
Resolution 868 (Official Bulletin 24)
| Country | Prefix | |
|---|---|---|
| Dominican Republic | HI- | |
| Lithuania | LY- |
Resolution 941 (Official Bulletin 25)
| Country | Prefix | Notes |
|---|---|---|
| Argentine Republic | LV- | Any combination of three letters commencing A, B or C |
| Austria | OE- | |
| Nicaragua | YN- |
Resolution 1019 (Official Bulletin 26)
| Country | Prefix | |
|---|---|---|
| Paraguay | ZP- | |
| Burma | XY- |