This article should be merged with ITU prefix

The International Telecommunications Union sets many international standards for radio usage around the world. Among these standards are the first characters of radio station callsigns. All radio and television broadcasters, amateur radio operators, and other users of the radio spectrum are assigned callsigns by their country's telecommunications regulatory authority, and are usually required to transmit their callsign at periodic intervals.

Here is the most current list of callsign prefixes assigned by the ITU.

Callsign series	Allocated to
AA-AL	United States of America (non-broadcast)
AM-AO	Spain
AP-AS	Pakistan (Islamic Republic of)
AT-AW	India (Republic of)
AX	Australia
AY-AZ	Argentine Republic
A2	Botswana (Republic of)
A3	Tonga (Kingdom of)
A4	Oman (Sultanate of)
A5	Bhutan (Kingdom of)
A6	United Arab Emirates
A7	Qatar (State of)
A8	Liberia (Republic of)
A9	Bahrain (State of)
B	China (People's Republic of)
CA-CE *	Chile
CF-CK	Canada *
CL-CM	Cuba
CN	Morocco (Kingdom of)
CO	Cuba
CP	Bolivia (Republic of)
CQ-CU	Portugal
CV-CX	Uruguay (Eastern Republic of)
CY-CZ	Canada
C2	Nauru (Republic of)
C3	Andorra (Principality of)
C4	Cyprus (Republic of)
C5	Gambia (Republic of the)
C6	Bahamas (Commonwealth of the)
C7	World Meteorological Organization
C8-C9	Mozambique (Republic of)
DA-DR	Germany (Federal Republic of)
DS-DT	Korea (Republic of)
DU-DZ	Philippines (Republic of the)
D2-D3	Angola (Republic of)
D4	Cape Verde (Republic of)
D5	Liberia (Republic of)
D6	Comoros (Islamic Federal Republic of the)
D7-D9	Korea (Republic of)
EA-EH	Spain
EI-EJ	Ireland
EK	Armenia (Republic of)
EL	Liberia (Republic of)
EM-EO	Ukraine
EP-EQ	Iran (Islamic Republic of)
ER	Moldova (Republic of)
ES	Estonia (Republic of)
ET	Ethiopia (Federal Democratic Republic of)
EU-EW	Belarus (Republic of)
EX	Kyrgyz Republic
EY	Tajikistan (Republic of)
EZ	Turkmenistan
E2	Thailand
E3	Eritrea
E4	Palestinian Authority
F	France
G	United Kingdom of Great Britain and Northern Ireland
HA	Hungary (Republic of)
HB	Switzerland (Confederation of)
HC-HD	Ecuador
HE	Switzerland (Confederation of)
HF	Poland (Republic of)
HG	Hungary (Republic of)
HH	Haiti (Republic of)
HI	Dominican Republic
HJ-HK	Colombia (Republic of)
HL	Korea (Republic of)
HM	Democratic People's Republic of Korea
HN	Iraq (Republic of)
HO-HP	Panama (Republic of)
HQ-HR	Honduras (Republic of)
HS	Thailand
HT	Nicaragua
HU	El Salvador (Republic of)
HV	Vatican City State
HW-HY	France
HZ	Saudi Arabia (Kingdom of)
H2	Cyprus (Republic of)
H3	Panama (Republic of)
H4	Solomon Islands
H6-H7	Nicaragua
H8-H9	Panama (Republic of)
I	Italy
JA-JS	Japan
JT-JV	Mongolia
JW-JX	Norway
JY	Jordan (Hashemite Kingdom of)
JZ	Indonesia (Republic of)
J2	Djibouti (Republic of)
J3	Grenada
J4	Greece
J5	Guinea-Bissau (Republic of)
J6	Saint Lucia
J7	Dominica (Commonwealth of)
J8	Saint Vincent and the Grenadines
K	United States of America
LA-LN	Norway
LO-LW	Argentine Republic
LX	Luxembourg
LY	Lithuania (Republic of)
LZ	Bulgaria (Republic of)
L2-L9	Argentine Republic
M	United Kingdom of Great Britain and Northern Ireland
N	United States of America (non-broadcast)
OA-OC	Peru
OD	Lebanon
OE	Austria
OF-OJ	Finland
OK-OL	Czech Republic
OM	Slovakia
ON-OT	Belgium
OU-OZ	Denmark
PA-PI	Netherlands (Kingdom of the)
PJ	Netherlands (Kingdom of the) - Netherlands Antilles
PK-PO	Indonesia (Republic of)
PP-PY	Brazil (Federative Republic of)
PZ	Suriname (Republic of)
P2	Papua New Guinea
P3	Cyprus (Republic of)
P4	Netherlands (Kingdom of the) - Aruba
P5-P9	Democratic People's Republic of Korea
R	Russian Federation
SA-SM	Sweden
SN-SR	Poland (Republic of)
SSA-SSM	Egypt (Arab Republic of)
SSN-STZ	Sudan (Republic of the)
SU	Egypt (Arab Republic of)
SV-SZ	Greece
S2-S3	Bangladesh (People's Republic of)
S5	Slovenia (Republic of)
S6	Singapore (Republic of)
S7	Seychelles (Republic of)
S8	South Africa (Republic of)
S9	São Tomé and Príncipe (Democratic Republic of)
TA-TC	Turkey
TD	Guatemala (Republic of)
TE	Costa Rica
TF	Iceland
TG	Guatemala (Republic of)
TH	France
TI	Costa Rica
TJ	Cameroon (Republic of)
TK	France
TL	Central African Republic
TM	France
TN	Congo (Republic of the)
TO-TQ	France
TR	Gabonese Republic
TS	Tunisia
TT	Chad (Republic of)
TU	Côte d'Ivoire (Republic of)
TV-TX	France
TY	Benin (Republic of)
TZ	Mali (Republic of)
T2	Tuvalu
T3	Kiribati (Republic of)
T4	Cuba
T5	Somali Democratic Republic
T6	Afghanistan (Islamic State of)
T7	San Marino (Republic of)
T8	Palau (Republic of)
T9	Bosnia and Herzegovina (Republic of)
UA-UI	Russian Federation
UJ-UM	Uzbekistan (Republic of)
UN-UQ	Kazakhstan (Republic of)
UR-UZ	Ukraine
VA-VG	Canada
VH-VN *	Australia (VL for broadcast, VK for amateur)
VO	Canada (Newfoundland)
VP-VQ	United Kingdom of Great Britain and Northern Ireland
VR	China (People's Republic of) - Hong Kong
VS	United Kingdom of Great Britain and Northern Ireland
VT-VW	India (Republic of)
VX-VY	Canada
VZ	Australia
V2	Antigua and Barbuda
V3	Belize
V4	Saint Kitts and Nevis
V5	Namibia (Republic of)
V6	Micronesia (Federated States of)
V7	Marshall Islands (Republic of the)
V8	Brunei Darussalam
W	United States of America
XA-XI	Mexico (XE for AM, XH for FM)
XJ-XO	Canada
XP	Denmark
XQ-XR	Chile
XS	China (People's Republic of)
XT	Burkina Faso
XU	Cambodia (Kingdom of)
XV	Viet Nam (Socialist Republic of)
XW	Lao People's Democratic Republic
XX	Portugal
XY-XZ	Myanmar (Union of)
YA	Afghanistan (Islamic State of)
YB-YH	Indonesia (Republic of)
YI	Iraq (Republic of)
YJ	Vanuatu (Republic of)
YK	Syrian Arab Republic
YL	Latvia (Republic of)
YM	Turkey
YN	Nicaragua
YO-YR	Romania
YS	El Salvador (Republic of)
YT-YU	Yugoslavia (Federal Republic of)
YV-YY	Venezuela (Republic of)
YZ	Yugoslavia (Federal Republic of)
Y2-Y9	Germany (Federal Republic of)
ZA	Albania (Republic of)
ZB-ZJ	United Kingdom of Great Britain and Northern Ireland
ZK-ZM	New Zealand
ZN-ZO	United Kingdom of Great Britain and Northern Ireland
ZP	Paraguay (Republic of)
ZQ	United Kingdom of Great Britain and Northern Ireland
ZR-ZU	South Africa (Republic of)
ZV-ZZ	Brazil (Federative Republic of)
Z2	Zimbabwe (Republic of)
Z3	The Former Yugoslav Republic of Macedonia
2	United Kingdom of Great Britain and Northern Ireland
3A	Monaco (Principality of)
3B	Mauritius (Republic of)
3C	Equatorial Guinea (Republic of)
3DA-3DM	Swaziland (Kingdom of)
3DN-3DZ	Fiji (Republic of)
3E-3F	Panama (Republic of)
3G	Chile
3H-3U	China (People's Republic of)
3V	Tunisia
3W	Viet Nam (Socialist Republic of)
3X	Guinea (Republic of)
3Y	Norway
3Z	Poland (Republic of)
4A-4C	Mexico
4D-4I	Philippines (Republic of the)
4J-4K	Azerbaijani Republic
4L	Georgia (Republic of)
4M	Venezuela (Republic of)
4N-4O	Yugoslavia (Federal Republic of)
4P-4S	Sri Lanka (Democratic Socialist Republic of)
4T	Peru
4U-4U	United Nations
4V	Haiti (Republic of)
4W	United Nations
4X	Israel (State of)
4Y	International Civil Aviation Organization
4Z	Israel (State of)
5A	Libya (Socialist People's Libyan Arab Jamahiriya)
5B	Cyprus (Republic of)
5C-5G	Morocco (Kingdom of)
5H-5I	Tanzania (United Republic of)
5J-5K	Colombia (Republic of)
5L-5M	Liberia (Republic of)
5N-5O	Nigeria (Federal Republic of)
5P-5Q	Denmark
5R-5S	Madagascar (Republic of)
5T	Mauritania (Islamic Republic of)
5U	Niger (Republic of the)
5V	Togolese Republic
5W	Western Samoa (Independent State of)
5X	Uganda (Republic of)
5Y-5Z	Kenya (Republic of)
6A-6B	Egypt (Arab Republic of)
6C	Syrian Arab Republic
6D-6J	Mexico
6K-6N	Korea (Republic of)
6O-6O	Somali Democratic Republic
6P-6S	Pakistan (Islamic Republic of)
6T-6U	Sudan (Republic of the)
6V-6W	Senegal (Republic of)
6X	Madagascar (Republic of)
6Y	Jamaica
6Z	Liberia (Republic of)
7A-7I	Indonesia (Republic of)
7J-7N	Japan
7O	Yemen (Republic of)
7P	Lesotho (Kingdom of)
7Q	Malawi
7R	Algeria (People's Democratic Republic of)
7S	Sweden
7T-7Y	Algeria (People's Democratic Republic of)
7Z	Saudi Arabia (Kingdom of)
8A-8I	Indonesia (Republic of)
8J-8N	Japan
8O	Botswana (Republic of)
8P	Barbados
8Q	Maldives (Republic of)
8R	Guyana
8S	Sweden
8T-8Y	India (Republic of)
8Z	Saudi Arabia (Kingdom of)
9A	Croatia (Republic of)
9B-9D	Iran (Islamic Republic of)
9E-9F	Ethiopia (Federal Democratic Republic of)
9G	Ghana
9H	Malta
9I-9J	Zambia (Republic of)
9K	Kuwait (State of)
9L	Sierra Leone
9M	Malaysia
9N	Nepal
9O-9T	Democratic Republic of the Congo
9U	Burundi (Republic of)
9V	Singapore (Republic of)
9W	Malaysia
9X	Rwandese Republic
9Y-9Z	Trinidad and Tobago
Callsign series	Allocated to

*Note: Australian broadcasters usually drop the VL prefix, thus "5UV" or "2XX" actually means VL5UV or VL2XX. The CBC in Canada uses CB, though this is not internationally legal because it is assigned to Chile.