The Radio Prefix Listing for all amateur radio operators. By looking at the callsign, you can determine where the operator is from.


                    
Prefix      Entity
1A0         Sov. Mil. Order of Malta
3A          Monaco
3B6,7       Agalega & St. Brandon
3B8         Mauritius
3B9         Rodrigues Island
3C          Equatorial Guinea
3C0         Pagalu Island
3D2         Fiji
3D2         Conway Reef
3D2         Rotuma Island
3DA         Swaziland
3V          Tunisia
3W,XV	    Vietnam
3X          Guinea
3Y          Bouvet
3Y          Peter 1 Island
4J,4K       Azerbaijan
4L          Georgia
4P-4S       Sri Lanka
4U_ITU      ITU Headquarters
4U_UN       United Nations Headquarters
4W          U.N. Transitional Admin, East Timor
4X,4Z       Israel
5A          Libya
5B          Cyprus
5H-5I       Tanzania
5N-5O       Nigeria
5R-5S       Madagascar
5T          Mauritania
5U          Niger
5V          Togo
5W          Samoa
5X          Uganda
5Y-5Z       Kenya
6V-6W       Senegal
6Y          Jamaica
7O          Yemen
7P          Lesotho
7Q          Malawi
7T-7Y       Algeria
8P          Barbados
8Q          Maldives
8R          Guyana
9A          Croatia
9G          Ghana
9H          Malta
9I-9J       Zambia
9K          Kuwait
9L          Sierra Leone
9M2,4       West Malaysia
9M6,8       East Malaysia
9N          Nepal
9Q-9T       Democratic Republic of Congo
9U          Burundi
9V          Singapore
9X          Rwanda
9Y-9Z       Trinidad & Tobago
A2          Botswana
A3          Tonga
A4          Oman
A5          Bhutan
A6          United Arab Emirates
A7          Qatar
A9          Bahrain
AP-AS       Pakistan
BS7         Scarborough Reef
BV          Taiwan
BV9P        Pratas
BY,BT       China
C2          Nauru
C3          Andorra
C5          The Gambia
C6          Bahamas
C8-9        Mozambique
CA-CE       Chile
CE0         Easter Island
CE0         Juan Fernandez Island
CE0         San Felix & San Ambrosio
CE9/KC4     Antarctica
CM,CO       Cuba
CN          Morocco
CP          Bolivia
CT          Portugal
CT3         Madeira Island
CU          Azores
CV-CX       Uruguay
CY0         Sable Island
CY9         St. Paul Island
D2-3        Angola
D4          Cape Verde
D6          Comoros
DA-DL       Federal Republic of Germany
DU-DZ       Philippines
E3          Eritrea
E4          Palestine
EA-EH       Spain
EA6-EH6     Balearic Island
EA8-EH8     Canary Islands
EA9-EH9     Ceuta & Melilla
EI-EJ       Ireland
EK          Armenia
EL          Liberia
EP-EQ       Iran
ER          Moldovia
ES          Estonia
ET          Ethiopia
EU,EV,EW    Belarus
EX          Kyrgystan
EY          Tajikistan
EZ          Turkmenistan
F           France
FG          Guadeloupe
FJ,FS       Saint Martin
FH          Mayotte
FK          New Caledonia
FK/C        Chesterfield Island
FM          Martinique
FO          Austral Island
FO          Clipperton Island
FO          French Polynesia
FO          Marquesas Island
FP          St. Pierre & Miquelon
FR/G        Glorioso Island
FR/J,E      Juan de Nova, Europa
FR          Reunion Island
FR/T        Tromelin Island
FT8W        Crozet Island
FT8X        Kerguelen Island
FT8Z        Amsterdam & St. Paul Island
FW          Wallis & Futuna Island
FY          French Guiana
G,GX        England
GD,GT       Isle of Man
GI,GN       Northern Ireland
GJ,GH       Jersey
GM,GS       Scotland
GU,GP       Guernsey
GW,GC       Wales
H4          Solomon Islands
H40         Temotu Province
HA,HG       Hungary
HB          Switzerland
HB          Liechtenstein
HC-HD       Ecuador
HC8-HD8     Galapagos Islands
HH          Haiti
HI          Dominican Republic
HJ-HK       Colombia
HK0         Malpelo Island
HK0         San Andres & Providencia
HL          South Korea
HO-HP       Panama
HQ-HR       Honduras
HS,E2       Thailand
HV          Vatican
HZ          Saudi Arabia
I           Italy
IS,IM       Sardinia
J2          Djibouti
J3          Grenada
J5          Guinea-Bissau
J6          St. Lucia
J7          Dominica
J8          St. Vincent
JA-JS       Japan
JD1         Minami Torishima
JD1         Ogasawara
JT-JV       Mongolia
JW          Svalbard
JX          Jan Mayen
JY          Jordan
K,W,N, 	    \
3,4,5        United States of America
AA-AK       /
KC6,T8      Palau
KG4         Guantanamo Bay
KH0         Mariana Island
KH1         Baker & Howland Islands
KH2         Guam
KH3         Johnston Island
KH4         Midway Island
KH5         Palmyra & Jarvis Island
KH5K        Kingman Reef
KH6,7       Hawaii
KH7K        Kure Island
KH8         American Samoa
KH9         Wake Island
KL7         Alaska
KP1         Navassa Island
KP2         Virgin Islands
KP3,4       Puerto Rico
KP5         Desecheo Island
LA-LN       Norway
LO-LW       Argentina
LX          Luxembourg
LY          Lithuania
LZ          Bulgaria
OA-OC       Peru
OD          Lebanon
OE          Austria
OF-OI       Finland
OH0         Aland Island
OJ0,OH0M    Market Reef
OK-OL       Czech Republic
OM          Slovak Republic
ON-OT       Belgium
OX          Greenland
OY          Faroe Island
OZ          Denmark
P2          Papua New Guinea
P4          Aruba
P5          North Korea
PA-PI       Netherlands
PJ2,4,9     Bonaire,Curacao
              (Neth. Antilles)
PJ5-8       St.Maarten,Saba,
              St.Eustatius
PP-PY       Brazil
PP0-PY0F    Fernando de Noronha Islands
PP0-PY0S    St. Peter & 
              St. Paul Rocks
PP0-PY0T    Trindade & Martim
              Vaz Islands
PZ          Suriname
R1FJ        Franz Josef Land
R1MV        Malyj Vysotskij Island
S0          Western Sahara
S2          Bangladesh
S5,YU3      Slovenia
S7          Seychelles
S9          Sao Tome & Principe
SA-SM       Sweden
SN-SR       Poland
ST          Sudan
SU          Egypt
SV-SZ       Greece
SV/A        Mount Athos
SV5         Dodecanese
SV9         Crete
T2          Tuvalu
T30         Western Kiribati 
             (Gilbert Islands)
T31         Central Kiribati 
             (Brit. Phoenix Islands)
T32         Eastern Kiribati
             (Line Islands)
T33         Banaba Island (Ocean Island)
T5          Somalia
T7          San Marino
T9          Bosnia-Herzegovina 
TA-TC       Turkey
TF          Iceland
TG,TD       Guatemala
TI, TE      Costa Rica
TI9         Cocos Islands
TJ          Cameroon
TK          Corsica
TL          Central Africa
TN          Congo
TR          Gabon
TT          Chad
TU          Cote d'Ivoire
TY          Benin
TZ          Mali
UA-UI       \
1,3,4,6      European Russia
RA-RZ       / 
UA2         Kaliningrad
UA-UI       \
8,9,0        Asiatic Russia
RA-RZ       /
UJ-UM       Uzbekistan
UN-UQ       Kazakhstan
UR-UZ,EM-EO Ukraine
V2          Antigua & Barbuda
V3          Belize
V4          St.Kitts & Nevis Islands
V5          Namibia
V6          Micronesia
V7          Marshall Island
V8          Brunei
VE,VO,VY    Canada
VK          Australia
VK0         Heard Island
VK0         Macquarie Island
VK9C        Cocos-Keeling Island
VK9L        Lord Howe Island
VK9M        Mellish Reef
VK9N        Norfolk Island
VK9W        Willis Island
VK9X        Christmas Island
VP2E        Anguilla
VP2M        Montserrat
VP2V        British Virgin Islands
VP5         Turks & Caicos Islands
VP6         Pitcairn Island
VP8         Falkland Island
VP8,LU      South Georgia Island
VP8,LU      South Orkney Island
VP8,LU      South Sandwich Islands
VP8,LU,     \
CE9,HF0      South Shetland Islands
4K1         /
VP9         Bermuda
VQ9         Chagos Island
VS6,VR2     Hong Kong
VU          India
VU          Andaman & Nicobar Island
VU          Laccadive Island
XA-XI       Mexico
XA4-XI4     Revilla Gigedo
XT          Burkina Faso
XU          Cambodia
XW          Laos
XX9         Macao
XY-XZ       Myanmar
YA          Afghanistan
YB-YH       Indonesia
YI          Iraq
YJ          Vanuatu
YK          Syria
YL          Latvia
YN          Nicaragua
YO-YR       Romania
YS          El Salvador
YT-YU,YZ    Yugoslavia
YV-YY       Venezuela
YV0         Aves Island
Z2          Zimbabwe
Z3          Macedonia
ZA          Albania
ZB2         Gibraltar
ZC4         UK Sov. Base Areas on Cyprus
ZD7         St. Helena
ZD8         Ascension Island
ZD9         Tristan da Cunha & Gough Island
ZF          Cayman Islands
ZK1         North Cook Island
ZK1         South Cook Islands
ZK2         Niue
ZK3         Tokelau Island
ZL-ZM       New Zealand
ZL7         Chatham Island
ZL8         Kermadec Island
ZL9         Auckland & Campbell Islands
ZP          Paraguay
ZR-ZU       South Africa
ZS8         Prince Edward & Marion Island

At the very least, you can improve your geography knowledge by finding these entities on a map.