Pre-1928 Allocations
Note: in the suffix pattern, n represents a number, x represents a letter
| Country / Region | Registration Prefix | Suffix Pattern | 1913 radio call letters |
|---|---|---|---|
| Abyssinia | A-B | A-Bxxx | |
| Afghanistan | Y-A | Y-Axxx | |
| Albania | B-A | B-Axxx | |
| Argentina | R-A | R-Axxx | LIA to LRZ |
| Australia | G-AU | G-AUxx | VHA to VKZ |
| Austria-Hungary and Bosnia-Herzegovina | HAA to HFZ, OGA to OMZ and UNA to UZZ | ||
| Belgium | O-B | O-Bxxx | ONA to OTZ |
| Bolivia | C-B | C-Bxxx | none |
| Brazil | P-B | P-Bxxx | SNA to STZ |
| Canada | G-C | G-Cxxx, except G-CYxx | VAA to VGZ (Newfoundland: VOA to VOZ) |
| G-CY (military aircraft) | G-CYxx | ||
| Bulgaria | B-B | B-Bxxx | LXA to LZZ |
| Chile | B-C | B-Cxxx | COA to CPZ |
| China | X-C | X-Cxxx | none |
| Colombia | C- | C-n to C-nnn | none |
| Costa Rica | K-C | K-Cxxx | |
| Cuba | C-C | C-Cxxx | none |
| Czechoslovakia | L-B | L-Bxxx | |
| Danzig | |||
| Y-M | Y-Mxxx | Not applicable | |
| Dz- | Dz-nnn | ||
| Denmark | T-D | T-Dxxx | OUA to OZZ |
| Dominica | Z-D | Z-Dxxx | |
| Ecuador | E-E | E-Exxx | |
| Egypt | SUA to SUZ | ||
| El Salvador | Y-S | Y-Sxxx | |
| Estonia | E-A | E-Axxx | |
| Finland | K-S | K-Sxxx | |
| France | F- | F-xxxx | F and UAA to UMZ |
| Germany | D- | D-nnnn | A, D and KAA to KCZ |
| Greece | S-G | S-Gxxx | SVA to SZZ |
| Guatemala | L-G | L-Gxxx | |
| Haiti | H-H | H-Hxxx | |
| Hedjaz | A-H | A-Hxxx | |
| Honduras | X-H | X-Hxxx | |
| Hungary | |||
| H-H | H-Hxxx | ||
| H-O | H-Oxxx | ||
| India | G-I | G-Ixxx | VTA to VWZ |
| Italy | I- | I-xxxx | I |
| Japan | J- | J-xxxx | J |
| Latvia | B-L | B-Lxxx | |
| Liberia | L-L | L-Lxxx | |
| Lithuania | Z-L | Z-Lxxx | |
| Luxembourg | L-U | L-Uxxx | |
| Mexico | XAA to XCZ | ||
| Monaco | M-M | M-Mxxx | CQA to CQZ |
| M-O | M-Oxxx | ||
| Morocco | CNA to CNZ | ||
| Netherlands | H-N | H-Nxxx | PAA to PMZ |
| New Zealand | G-NZ | G-NZxx | VLA to VMZ |
| Nicaragua | A-N | A-Nxxx | |
| Norway | LAA to LHZ | ||
| Panama | S-P | S-Pxxx | |
| Persia | P-I | P-Ixxx | |
| Peru | O-P | O-Pxxx | |
| Poland | P-P | P-Pxxx | |
| Portugal | C-P | C-Pxxx | CRA to CTZ |
| Romania | C-R | C-Rxxx | CVA to CVZ |
| Russia | R-R | R-Rxxx, RR-xxx | R |
| Serbia-Croatia-Slavonia | X-S | X-Sxxx | |
| Siam | H-S | H-Sxxx | HGA to HHZ |
| South Africa | G-UA | G-UAxx | VNA to VNZ |
| Spain | M- | M-xxxx | EAA to EGZ |
| Sweden | S-A | S-Axxx | SAA to SMZ |
| Switzerland | C-H | C-Hnnn | |
| United States of America | N | N-xxxx | KDA to KZZ, N and W |
| United Kingdom | K | K-nnn | B, G and M (British colonies not autonomous: VPA to VSZ) |
| G-E | G-EAxx, G-EBxx, G-EDCA | ||
| G-F (lighter than air craft) | G-FAAx | ||
| G-G (gliders) | G-GAAx | ||
| Uruguay | C-U | C-Uxxx | CWA to CWZ |
- Notes
- ^ Adopted at the International Commission for Air Navigation (ICAN) meeting of 13 October 1919.
- ^ Adopted at the ICAN meeting of 13 July 1922.
- ^ Adopted at the ICAN meeting of 25 October 1922.
- ^ Adopted at the ICAN meeting of 28 February 1923.
- ^ The ICAN meeting of 28 February 1923 amended Ecuador's marks to E-U, Haiti's to H-E, and Uruguay's marks to C-M. They were restored to their original marks at the following meeting on 26 June.
- ^ Adopted at the ICAN meeting of 26 June 1923.
- ^ Amended at the ICAN meeting of 26 June 1923.
- ^ Adopted at the ICAN meeting of 3 March 1924.
- ^ Adopted at the ICAN meeting of 14 October 1924.
- ^ Adopted at the ICAN meeting of 6 April 1925.
- ^ Adopted at the ICAN meeting of 6 October 1925.
- ^ Adopted at the ICAN meeting of 3 November 1926.
- ^ Adopted at the ICAN meeting of 25 April 1927.
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