The ITU allocates callsign prefixes for radio stations. These prefixes are agreed upon internationally. A callsign can be any number of letters and digits but each country must only use callsigns that begin with the characters allocated for use in that country.

Of the second and or third letter of the prefix in the list below, if the country 'owns' all of A to Z in that position, then that country can also use the digits 0 to 9 in that position.

E.g. The USA owns KAA - KZZ so can also use prefixes like KA1 KP4 K5 K9 and so on.

The USA also owns AAA - ALZ so can use AL4 AL8 etc but can NOT use A4 or A9 because they do not own the whole of AA to AZ they only have AA to AL.

See also Country_codes

Table of Allocation of International Call Sign Series

Call Sign Series Allocated to

A
AAA-ALZ United States of America
AMA-AOZ Spain
APA-ASZ Pakistan (Islamic Republic of)
ATA-AWZ India (Republic of)
AXA-AXZ Australia
AYA-AZZ Argentine Republic
A2A-A2Z Botswana (Republic of)
A3A-A3Z Tonga (Kingdom of)
A4A-A4Z Oman (Sultanate of)
A5A-A5Z Bhutan (Kingdom of)
A6A-A6Z United Arab Emirates
A7A-A7Z Qatar (State of)
A8A-A8Z Liberia (Republic of)
A9A-A9Z Bahrain (State of)

B
BAA-BZZ China (People's Republic of)

C
CAA-CEZ Chile
CFA-CKZ Canada
CLA-CMZ Cuba
CNA-CNZ Morocco (Kingdom of)
COA-COZ Cuba
CPA-CPZ Bolivia (Republic of)
CQA-CUZ Portugal
CVA-CXZ Uruguay (Eastern Republic of)
CYA-CZZ Canada
C2A-C2Z Nauru (Republic of)
C3A-C3Z Andorra (Principality of)
C4A-C4Z Cyprus (Republic of)
C5A-C5Z The Gambia (Republic of)
C6A-C6Z Bahamas (Commonwealth of the)
C7A-C7Z World Meteorological Organization ~Note 1
C8A-C9Z Mozambique (Republic of)

D
DAA-DRZ Germany (Federal Republic of)
DSA-DTZ Korea (Republic of)
DUA-DZZ Philippines (Republic of the)
D2A-D3Z Angola (Republic of)
D4A-D4Z Cape Verde (Republic of)
D5A-D5Z Liberia (Republic of)
D6A-D6Z Comoros (Islamic Federal Republic of the)
D7A-D9Z Korea (Republic of)

E
EAA-EHZ Spain
EIA-EJZ Ireland
EKA-EKZ Armenia (Republic of)
ELA-ELZ Liberia (Republic of)
EMA-EOZ Ukraine
EPA-EQZ Iran (Islamic Republic of)
ERA-ERZ Moldova (Republic of)
ESA-ESZ Estonia (Republic of)
ETA-ETZ Ethiopia (Federal Democratic Republic of)
EUA-EWZ Belarus (Republic of)
EXA-EXZ Kyrgyz Republic
EYA-EYZ Tajikistan (Republic of)
EZA-EZZ Turkmenistan
E2A-E2Z Thailand
E3A-E3Z Eritrea
E4A-E4Z Palestinian Authority ~Note 2

F
FAA-FZZ France

G
GAA-GZZ United Kingdom of Great Britain and Northern Ireland

H
HAA-HAZ Hungary (Republic of)
HBA-HBZ Switzerland (Confederation of)
HCA-HDZ Ecuador
HEA-HEZ Switzerland (Confederation of)
HFA-HFZ Poland (Republic of)
HGA-HGZ Hungary (Republic of)
HHA-HHZ Haiti (Republic of)
HIA-HIZ Dominican Republic
HJA-HKZ Colombia (Republic of)
HLA-HLZ Korea (Republic of)
HMA-HMZ Democratic People's Republic of Korea
HNA-HNZ Iraq (Republic of)
HOA-HPZ Panama (Republic of)
HQA-HRZ Honduras (Republic of)
HSA-HSZ Thailand
HTA-HTZ Nicaragua
HUA-HUZ El Salvador (Republic of)
HVA-HVZ Vatican City State
HWA-HYZ France
HZA-HZZ Saudi Arabia (Kingdom of)
H2A-H2Z Cyprus (Republic of)
H3A-H3Z Panama (Republic of)
H4A-H4Z Solomon Islands
H6A-H7Z Nicaragua
H8A-H9Z Panama (Republic of)

I
IAA-IZZ Italy

J
JAA-JSZ Japan
JTA-JVZ Mongolia
JWA-JXZ Norway
JYA-JYZ Jordan (Hashemite Kingdom of)
JZA-JZZ Indonesia (Republic of)
J2A-J2Z Djibouti (Republic of)
J3A-J3Z Grenada
J4A-J4Z Greece
J5A-J5Z Guinea-Bissau (Republic of)
J6A-J6Z Saint Lucia
J7A-J7Z Dominica (Commonwealth of)
J8A-J8Z Saint Vincent and the Grenadines

K
KAA-KZZ United States of America

L
LAA-LNZ Norway
LOA-LWZ Argentine Republic
LXA-LXZ Luxembourg
LYA-LYZ Lithuania (Republic of)
LZA-LZZ Bulgaria (Republic of)
L2A-L9Z Argentine Republic

M
MAA-MZZ United Kingdom of Great Britain and Northern Ireland

N
NAA-NZZ United States of America

O
OAA-OCZ Peru
ODA-ODZ Lebanon
OEA-OEZ Austria
OFA-OJZ Finland
OKA-OLZ Czech Republic
OMA-OMZ Slovak Republic
ONA-OTZ Belgium
OUA-OZZ Denmark

P
PAA-PIZ Netherlands (Kingdom of the)
PJA-PJZ Netherlands (Kingdom of the) - Netherlands Antilles
PKA-POZ Indonesia (Republic of)
PPA-PYZ Brazil (Federative Republic of)
PZA-PZZ Suriname (Republic of)
P2A-P2Z Papua New Guinea
P3A-P3Z Cyprus (Republic of)
P4A-P4Z Aruba
P5A-P9Z Democratic People's Republic of Korea

Q

There are no prefixes beginning Q ~Note 3

R
RAA-RZZ Russian Federation

S
SAA-SMZ Sweden
SNA-SRZ Poland (Republic of)
SSA-SSM Egypt (Arab Republic of)
SSN-STZ Sudan (Republic of the)
SUA-SUZ Egypt (Arab Republic of)
SVA-SZZ Greece
S2A-S3Z Bangladesh (People's Republic of)
S5A-S5Z Slovenia (Republic of)
S6A-S6Z Singapore (Republic of)
S7A-S7Z Seychelles (Republic of)
S8A-S8Z South Africa (Republic of)
S9A-S9Z São Tomé and Príncipe (Democratic Republic of)

T
TAA-TCZ Turkey
TDA-TDZ Guatemala (Republic of)
TEA-TEZ Costa Rica
TFA-TFZ Iceland
TGA-TGZ Guatemala (Republic of)
THA-THZ France
TIA-TIZ Costa Rica
TJA-TJZ Cameroon (Republic of)
TKA-TKZ France
TLA-TLZ Central African Republic
TMA-TMZ France
TNA-TNZ Congo (Republic of the)
TOA-TQZ France
TRA-TRZ Gabonese Republic
TSA-TSZ Tunisia
TTA-TTZ Chad (Republic of)
TUA-TUZ Côte d'Ivoire (Republic of)
TVA-TXZ France
TYA-TYZ Benin (Republic of)
TZA-TZZ Mali (Republic of)
T2A-T2Z Tuvalu
T3A-T3Z Kiribati (Republic of)
T4A-T4Z Cuba
T5A-T5Z Somali Democratic Republic
T6A-T6Z Afghanistan (Islamic State of)
T7A-T7Z San Marino (Republic of)
T8A-T8Z Palau (Republic of)
T9A-T9Z Bosnia and Herzegovina (Republic of)

U
UAA-UIZ Russian Federation
UJA-UMZ Uzbekistan (Republic of)
UNA-UQZ Kazakhstan (Republic of)
URA-UZZ Ukraine

V
VAA-VGZ Canada
VHA-VNZ Australia
VOA-VOZ Canada
VPA-VQZ United Kingdom of Great Britain and Northern Ireland
VRA-VRZ China (People's Republic of) - Hong Kong ~Note 2
VSA-VSZ United Kingdom of Great Britain and Northern Ireland
VTA-VWZ India (Republic of)
VXA-VYZ Canada
VZA-VZZ Australia
V2A-V2Z Antigua and Barbuda
V3A-V3Z Belize
V4A-V4Z Saint Kitts and Nevis
V5A-V5Z Namibia (Republic of)
V6A-V6Z Micronesia (Federated States of)
V7A-V7Z Marshall Islands (Republic of the)
V8A-V8Z Brunei Darussalam

W
WAA-WZZ United States of America

X
XAA-XIZ Mexico
XJA-XOZ Canada
XPA-XPZ Denmark
XQA-XRZ Chile
XSA-XSZ China (People's Republic of)
XTA-XTZ Burkina Faso
XUA-XUZ Cambodia (Kingdom of)
XVA-XVZ Viet Nam (Socialist Republic of)
XWA-XWZ Lao People's Democratic Republic
XXA-XXZ Portugal
XYA-XZZ Myanmar (Union of)

Y
YAA-YAZ Afghanistan (Islamic State of)
YBA-YHZ Indonesia (Republic of)
YIA-YIZ Iraq (Republic of)
YJA-YJZ Vanuatu (Republic of)
YKA-YKZ Syrian Arab Republic
YLA-YLZ Latvia (Republic of)
YMA-YMZ Turkey
YNA-YNZ Nicaragua
YOA-YRZ Romania
YSA-YSZ El Salvador (Republic of)
YTA-YUZ Yugoslavia (Federal Republic of)
YVA-YYZ Venezuela (Republic of)
YZA-YZZ Yugoslavia (Federal Republic of)
Y2A-Y9Z Germany (Federal Republic of)

Z
ZAA-ZAZ Albania (Republic of)
ZBA-ZJZ United Kingdom of Great Britain and Northern Ireland
ZKA-ZMZ New Zealand
ZNA-ZOZ United Kingdom of Great Britain and Northern Ireland
ZPA-ZPZ Paraguay (Republic of)
ZQA-ZQZ United Kingdom of Great Britain and Northern Ireland
ZRA-ZUZ South Africa (Republic of)
ZVA-ZZZ Brazil (Federative Republic of)
Z2A-Z2Z Zimbabwe (Republic of)
Z3A-Z3Z The Former Yugoslav Republic of Macedonia

2
2AA-2ZZ United Kingdom of Great Britain and Northern Ireland

3
3AA-3AZ Monaco (Principality of)
3BA-3BZ Mauritius (Republic of)
3CA-3CZ Equatorial Guinea (Republic of)
3DA-3DM Swaziland (Kingdom of) ~Note 1
3DN-3DZ Fiji (Republic of) ~Note 1
3EA-3FZ Panama (Republic of)
3GA-3GZ Chile
3HA-3UZ China (People's Republic of)
3VA-3VZ Tunisia
3WA-3WZ Viet Nam (Socialist Republic of)
3XA-3XZ Guinea (Republic of)
3YA-3YZ Norway
3ZA-3ZZ Poland (Republic of)

4
4AA-4CZ Mexico
4DA-4IZ Philippines (Republic of the)
4JA-4KZ Azerbaijani Republic
4LA-4LZ Georgia (Republic of)
4MA-4MZ Venezuela (Republic of)
4NA-4OZ Yugoslavia (Federal Republic of)
4PA-4SZ Sri Lanka (Democratic Socialist Republic of)
4TA-4TZ Peru
4UA-4UZ United Nations ~Note 1
4VA-4VZ Haiti (Republic of)
4WA-4WZ Timor-Leste (East Timor)
4XA-4XZ Israel (State of)
4YA-4YZ International Civil Aviation Organization ~Note 1
4ZA-4ZZ Israel (State of)

5
5AA-5AZ Libya (Socialist People's Libyan Arab Jamahiriya)
5BA-5BZ Cyprus (Republic of)
5CA-5GZ Morocco (Kingdom of)
5HA-5IZ Tanzania (United Republic of)
5JA-5KZ Colombia (Republic of)
5LA-5MZ Liberia (Republic of)
5NA-5OZ Nigeria (Federal Republic of)
5PA-5QZ Denmark
5RA-5SZ Madagascar (Republic of)
5TA-5TZ Mauritania (Islamic Republic of)
5UA-5UZ Niger (Republic of the)
5VA-5VZ Togolese Republic
5WA-5WZ Western Samoa (Independent State of)
5XA-5XZ Uganda (Republic of)
5YA-5ZZ Kenya (Republic of)

6
6AA-6BZ Egypt (Arab Republic of)
6CA-6CZ Syrian Arab Republic
6DA-6JZ Mexico
6KA-6NZ Korea (Republic of)
6OA-6OZ Somali Democratic Republic
6PA-6SZ Pakistan (Islamic Republic of)
6TA-6UZ Sudan (Republic of the)
6VA-6WZ Senegal (Republic of)
6XA-6XZ Madagascar (Republic of)
6YA-6YZ Jamaica
6ZA-6ZZ Liberia (Republic of)

7
7AA-7IZ Indonesia (Republic of)
7JA-7NZ Japan
7OA-7OZ Yemen (Republic of)
7PA-7PZ Lesotho (Kingdom of)
7QA-7QZ Malawi
7RA-7RZ Algeria (People's Democratic Republic of)
7SA-7SZ Sweden
7TA-7YZ Algeria (People's Democratic Republic of)
7ZA-7ZZ Saudi Arabia (Kingdom of)

8
8AA-8IZ Indonesia (Republic of)
8JA-8NZ Japan
8OA-8OZ Botswana (Republic of)
8PA-8PZ Barbados
8QA-8QZ Maldives (Republic of)
8RA-8RZ Guyana
8SA-8SZ Sweden
8TA-8YZ India (Republic of)
8ZA-8ZZ Saudi Arabia (Kingdom of)

9
9AA-9AZ Croatia (Republic of)
9BA-9DZ Iran (Islamic Republic of)
9EA-9FZ Ethiopia (Federal Democratic Republic of)
9GA-9GZ Ghana
9HA-9HZ Malta
9IA-9JZ Zambia (Republic of)
9KA-9KZ Kuwait (State of)
9LA-9LZ Sierra Leone
9MA-9MZ Malaysia
9NA-9NZ Nepal
9OA-9TZ Democratic Republic of the Congo
9UA-9UZ Burundi (Republic of)
9VA-9VZ Singapore (Republic of)
9WA-9WZ Malaysia
9XA-9XZ Rwandese Republic
9YA-9ZZ Trinidad and Tobago

~Note 1: Series allocated to an international organization.

~Note 2: Provisional allocation in accordance with No. S19.33:

(S19.33 Between radiocommunication conferences, the Secretary-General is authorized to deal with questions relating to changes in the allocation of series of call signs, on a provisional basis, and subject to confirmation by the following conference).

~Note 3: Three letter codes beginning with Q are for communication abbreviations, the Q Codess and not used as callsign prefixes.