1st ltr/num → 2nd ltr/num ↓	A	B	C	D	E	F	G	H	I
A	United States of America	People's Republic of China	Chile	Germany	Spain	France	United Kingdom	Hungary	Italy
B								Switzerland (HB0 prefix allocated to Liechtenstein)
C								Ecuador
D
E								Switzerland
F			Canada					Poland
G								Hungary
H								Haiti
I					Ireland			Dominican Republic
J								Colombia
K					Armenia
L			Cuba		Liberia			South Korea
1st ltr/num → 2nd ltr/num ↕	A	B	C	D	E	F	G	H	I
M	Spain	People's Republic of China	Cuba	Germany	Ukraine	France	United Kingdom	North Korea	Italy
N			Morocco					Iraq
O			Cuba					Panama
P	Pakistan		Bolivia		Iran
Q			Portugal					Honduras
R					Moldova
S				South Korea	Estonia			Thailand
T	India				Ethiopia			Nicaragua
U				Philippines	Belarus			El Salvador
V			Uruguay					Vatican City State
W								France
X	Australia				Kyrgyzstan
1st ltr/num → 2nd ltr/num ↕	A	B	C	D	E	F	G	H	I
Y	Argentina	People's Republic of China	Canada	Philippines	Tajikistan	France	United Kingdom	France	Italy
Z					Turkmenistan			Saudi Arabia
0	Not used		Not used	Not used	Not used			Not used
1
2	Botswana		Nauru	Angola	Thailand			Cyprus
3	Tonga		Andorra		Eritrea			Panama
4	Oman		Cyprus	Cape Verde	Palestinian Authority 2			Solomon Islands
5	Bhutan		The Gambia	Liberia	Cook Islands			Not used
6	United Arab Emirates		Bahamas	Comoros	Not used			Nicaragua
7	Qatar		World Meteorological Organization 1	South Korea				Nicaragua
8	Liberia		Mozambique					Panama
9	Bahrain							Panama

1st ltr/num → 2nd ltr/num ↓	J	K	L	M	N	O	P	Q	R
A	Japan	United States of America	Norway	United Kingdom	United States of America	Peru	Netherlands	Not used 3	Russia
B
C
D						Lebanon
E						Austria
F						Finland
G
H
I
J							Netherlands Antilles
K						Czech Republic	Indonesia
L
1st ltr/num → 2nd ltr/num ↕	J	K	L	M	N	O	P	Q	R
M	Japan	United States of America	Norway	United Kingdom	United States of America	Slovakia	Indonesia	Not used 3	Russia
N						Belgium
O			Argentina
P							Brazil
Q
R
S
T	Mongolia
U						Denmark
V
W	Norway
X			Luxembourg
1st ltr/num → 2nd ltr/num ↕	J	K	L	M	N	O	P	Q	R
Y	Jordan	United States of America	Lithuania	United Kingdom	United States of America	Denmark	Brazil	Not used 3	Russia
Z	Indonesia		Bulgaria				Suriname
0	Not used		Not used			Not used	Not used
1
2	Djibouti		Argentina				Papua New Guinea
3	Grenada						Cyprus
4	Greece						Aruba
5	Guinea-Bissau						North Korea
6	Saint Lucia
7	Dominica
8	Saint Vincent and the Grenadines
9	Not used

1st ltr/num → 2nd ltr/num ↓	S	T	U	V	W	X	Y	Z	0
A	Sweden	Turkey	Russia	Canada	United States of America	Mexico	Afghanistan	Albania	Not used
B							Indonesia	United Kingdom
C
D		Guatemala
E		Costa Rica
F		Iceland
G		Guatemala
H		France		Australia
I		Costa Rica					Iraq
J		Cameroon	Uzbekistan			Canada	Vanuatu
K		France					Syria	New Zealand
L		Central African Republic					Latvia
1st ltr/num → 2nd ltr/num ↕	S	T	U	V	W	X	Y	Z	0
M	Sweden	France	Uzbekistan	Australia	United States of America	Canada	Turkey	New Zealand	Not used
N	Poland	Republic of the Congo	Kazakhstan				Nicaragua	United Kingdom
O		France		Canada			Romania
P				United Kingdom		Denmark		Paraguay
Q						Chile		United Kingdom
R		Gabon	Ukraine	Hong Kong				South Africa
S	Egypt (A-M) Sudan (N-Z) 4	Tunisia		United Kingdom		People's Republic of China	El Salvador
T	Sudan	Chad		India		Burkina Faso	Serbia and Montenegro
U	Egypt	Côte d'Ivoire				Cambodia
V	Greece	France				Viet Nam	Venezuela	Brazil
W						Laos
X				Canada		Not used
1st ltr/num → 2nd ltr/num ↕	S	T	U	V	W	X	Y	Z	0
Y	Greece	Benin	Ukraine	Canada	United States of America	Myanmar	Venezuela	Brazil	Not used
Z		Mali		Australia			Serbia and Montenegro
0	Not used	Not used	Not used	Not used		Not used	Not used	Not used
1
2	Bangladesh	Tuvalu		Antigua and Barbuda			Germany	Zimbabwe
3		Kiribati		Belize				Macedonia
4	Not used	Cuba		Saint Kitts and Nevis				Not used
5	Slovenia	Somalia		Namibia
6	Singapore	Afghanistan		Federated States of Micronesia
7	Seychelles	San Marino		Marshall Islands
8	South Africa	Palau		Brunei Darussalam
9	São Tomé and Príncipe	Bosnia and Herzegovina		Not used

1st ltr/num → 2nd ltr/num ↓	1	2	3	4	5	6	7	8	9
A	Not used	United Kingdom	Monaco	Mexico	Libya	Egypt	Indonesia	Indonesia	Croatia
B			Mauritius		Cyprus				Iran
C			Equatorial Guinea		Morocco	Syria
D			Swaziland (A-M) Fiji (N-Z) 4	Philippines		Mexico
E			Panama						Ethiopia
F
G			Chile						Ghana
H			People's Republic of China		Tanzania				Malta
I									Zambia
J				Azerbaijan	Colombia		Japan	Japan
K						South Korea			Kuwait
L				Georgia	Liberia				Sierra Leone
1st ltr/num → 2nd ltr/num ↕	1	2	3	4	5	6	7	8	9
M	Not used	United Kingdom	People's Republic of China	Venezuela	Liberia	South Korea	Japan	Japan	Malaysia
N				Serbia and Montenegro	Nigeria				Nepal
O						Somalia	Yemen	Botswana	Democratic Republic of the Congo
P				Sri Lanka	Denmark	Pakistan	Lesotho	Barbados
Q							Malawi	Maldives
R					Madagascar		Algeria	Guyana
S							Sweden	Sweden
T				Peru	Mauritania	Sudan	Algeria	India
U				United Nations 1	Niger				Burundi
V			Tunisia	Haiti	Togo	Senegal			Singapore
W			Viet Nam	Timor-Leste	Samoa				Malaysia
X			Guinea	Israel	Uganda	Madagascar			Rwanda
1st ltr/num → 2nd ltr/num ↕	1	2	3	4	5	6	7	8	9
Y	Not used	United Kingdom	Norway	International Civil Aviation Organization 1	Kenya	Jamaica	Algeria	India	Trinidad and Tobago
Z			Poland	Israel		Liberia	Saudi Arabia	Saudi Arabia
0			Not used	Not used	Not used	Not used	Not used	Not used	Not used
1
2
3
4
5
6
7
8
9

¹ Series allocated to an international organization.

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).

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

⁴ Half series allocation.