The ITU specified one or more callsign series for each country (and large organizations).
The current list is observable at the ITU webpage.
Serie
Name
2A...2Z
Great Britain and Northern Ireland
3A
Monaco
3B
Mauritius
3C
Equatorial Guinea
3DA...3DM
Swaziland
3DN...3DZ
Fiji
3E, 3F
Panama
3G
Chile
3H...3U
China
3V
Tunisia
3W
Viet Nam
3X
Guinea
3Y
Norway
3Z
Poland
4A...4C
Mexico
4D...4I
Philippines
4J, 4K
Azerbaijan
4L
Georgia
4M
Venezuela
4O
Montenegro
4P...4S
Sri Lanka
4T
Peru
4U
United Nations
4V
Haiti
4W
Timor-Leste
4X
Israel
4Y
International Civil Aviation Organization
4Z
Israel
5A
Libya
5B
Cyprus
5C...5G
Morocco
5H, 5I
Tanzania
5J, 5K
Colombia
5L, 5M
Liberia
5N, 5O
Nigeria
5P, 5Q
Denmark
5R, 5S
Madagascar
5T
Mauritania 
5U
Niger
5V
Togo
5W
Samoa
5X
Uganda
5Y, 5Z
Kenya
6A, 6B
Egypt
6C
Syria
6D...6J
Mexico
6K...6N
Korea
6O
Somalia
6P...6S
Pakistan
6T, 6U
Sudan
6V, 6W
Senegal
6X
Madagascar
6Y
Jamaica
6Z
Liberia
7A...7I
Indonesia
7J...7N
Japan
7O
Yemen
7P
Lesotho
7Q
Malawi
7R
Algeria
7S
Sweden
7T...7Y
Algeria
7Z
Saudi Arabia
8A...8I
Indonesia
8J...8N
Japan
8O
Botswana
8P
Barbados
8Q
Maldives
8R
Guyana
8S
Sweden
8T...8Y
India
8Z
Saudi Arabia
9A
Croatia
9B...9D
Iran
9E, 9F
Ethiopia
9G
Ghana
9H
Malta
9I, 9J
Zambia
9K
Kuwait
9L
Sierra Leone
9M
Malaysia
9N
Nepal
9O...9T
Republic of Congo
9U
Burundi
9V
Singapore
9W
Malaysia
9X
Rwanda
9Y, 9Z
Trinidad and Tobago
A2
Botswana
A3
Tonga
A4
Oman
A5
Bhutan
A6
United Arab Emirates
A7
Qatar
A8
Liberia
A9
Bahrain
AA...AL
United States of America
AM...AO
Spain
AP...AS
Pakistan
AT...AW
India
AX
Australia
AY, AZ
Argentina
B
China
C2
Nauru
C3
Andorra
C4
Cyprus
C5
Gambia
C6
Bahamas
C7
World Meteorological Organization
C8, C9
Mozambique
CA...CE
Chile
CF...CK
Canada
CL, CM
Cuba
CN
Morocco
CO
Cuba
CP
Bolivia
CQ...CU
Portugal
CV...CX
Uruguay
CY, CZ
Canada
D2, D3
Angola
D4
Cape Verde
D5
Liberia
D6
Comoros
D7...D9
Korea
DA...DR
Germany
DS, DT
Korea
DU...DZ
Philippines
E2
Thailand
E3
Eritrea
E4
Palestine
E5
New Zealand - Cook Islands
E6
New Zealand - Niue
E7
Bosnia and Herzegovina
EA...EH
Spain
EI, EJ
Ireland
EK
Armenia
EL
Liberia
EM...EO
Ukraine
EP, EQ
Iran
ER
Moldova
ES
Estonia
ET
Ethiopia
EU...EW
Belarus
EX
Kyrgyzstan
EY
Tajikistan
EZ
Turkmenistan
F
France
G
Great Britain and Northern Ireland
H2
Cyprus
H3
Panama
H4
Solomon Islands
H6, H7
Nicaragua
H8, H9
Panama
HA
Hungary
HB
Switzerland
HC, HD
Ecuador
HE
Switzerland
HF
Poland
HG
Hungary
HH
Haiti
HI
Dominican Republic
HJ, HK
Colombia
HL
Korea
HM
Republic of Korea
HN
Iraq
HO, HP
Panama
HQ, HR
Honduras
HS
Thailand
HT
Nicaragua
HU
El Salvador
HV
Vatican City State
HW...HY
France
HZ
Saudi Arabia
I
Italy
J2
Djibouti
J3
Grenada
J4
Greece
J5
Guinea-Bissau
J6
Saint Lucia
J7
Dominica
J8
Saint Vincent and the Grenadines
JA...JS
Japan
JT...JV
Mongolia
JW, JX
Norway
JY
Jordan
JZ
Indonesia
K
United States of America
L2...L9
Argentina
LA...LN
Norway
LO...LW
Argentina
LX
Luxembourg
LY
Lithuania
LZ
Bulgaria
M
Great Britain and Northern Ireland
N
United States of America
OA...OC
Peru
OD
Lebanon
OE
Austria
OF...OJ
Finland
OK, OL
Czech
OM
Slovakia
ON...OT
Belgium
OU...OZ
Denmark
P2
Papua New Guinea
P3
Cyprus
P4
Netherlands - Aruba
P5...P9
Republic of Korea
PA...PI
Netherlands
PJ
Netherlands - Curaçao, St. Maarten
PJ
Netherlands - Bonaire, Saba und St. Eustatius
PJ
Netherlands - St. Maarten
PK...PO
Indonesia
PP...PY
Brazil
PZ
Suriname
R
Russia
S2, S3
Bangladesh
S5
Slovenia
S6
Singapore
S7
Seychelles
S8
South Africa
S9
Sao Tome and Principe
SA...SM
Sweden
SN...SR
Poland
SSA...SSM
Egypt
SSN...SSZ, ST
Sudan
SU
Egypt
SV...SZ
Greece
T2
Tuvalu
T3
Kiribati
T4
Cuba
T5
Somalia
T6
Afghanistan
T7
San Marino
T8
Palau
TA...TC
Turkey
TD
Guatemala
TE
Costa Rica
TF
Iceland
TG
Guatemala
TH
France
TI
Costa Rica
TJ
Cameroon
TK
France
TL
Central Africa
TM
France
TN
Congo
TO...TQ
France
TR
Gabon
TS
Tunisia
TT
Chad
TU
Ivory Coast
TV...TX
France
TY
Benin
TZ
Mali
U2...U9
Russia
UA...UI
Russia
UJ...UM
Uzbekistan
UN...UQ
Kazakhstan
UR...UZ
Ukraine
V2
Antigua and Barbuda
V3
Belize
V4
Saint Kitts and Nevis
V5
Namibia
V6
Micronesia
V7
Marshall Islands
V8
Brunei Darussalam
VA...VG
Canada
VH...VN
Australia
VO
Canada
VP, VQ
Great Britain and Northern Ireland
VR
China - Hong Kong
VS
Great Britain and Northern Ireland
VT...VW
India
VX, VY
Canada
VZ
Australia
W
United States of America
XA...XI
Mexico
XJ...XO
Canada
XP
Denmark
XQ, XR
Chile
XS
China
XT
Burkina Faso
XU
Cambodia
XV
Viet Nam
XW
Laos
XX
China - Macao
XY, XZ
Myanmar
Y2...Y9
Germany
YA
Afghanistan
YB...YH
Indonesia
YI
Iraq
YJ
Vanuatu
YK
Syria
YL
Latvia
YM
Turkey
YN
Nicaragua
YO...YR
Romania
YS
El Salvador
YT, YU
Serbia
YV...YY
Venezuela
Z2
Zimbabwe
Z3
Macedonia
Z8
South Sudan
ZA
Albania
ZB...ZJ
Great Britain and Northern Ireland
ZK...ZM
New Zealand
ZN, ZO
Great Britain and Northern Ireland
ZP
Paraguay
ZQ
Great Britain and Northern Ireland
ZR...ZU
South Africa
ZV...ZZ
Brazil
