Where can I use it?

ATA carnets are valid in the territories below (plus a few tiny ones omitted for clarity).

Types of use (right column – if blank, all uses are permitted):
A: Commercial samples
B: International trade fair / exhibition
C: Professional use

Albania
Algeria
Andorra
Australia
Bahrain Exhibitions / trade fairs only
Belarus
Bosnia and Herzegovina
Botswana
Canada In theory A only, but in practice will accept for C
Canary Islands
Ceuta and Melilla
Channel Islands (Guernsey & Jersey only)
Chile
China Carnets must be pre-registered with Chinese Customs
Cote d’Ivoire
European Union
Faroe Islands
French Guiana
French Polynesia
Gibraltar
Guadeloupe
Guyane
Hong Kong
Iceland
India B & C only; private meeting / demonstration also allowed, letter of invitation required
Indonesia B & C only
Iran (Islamic Republic of)
Israel
Japan
Kazakhstan B & C only
Korea, Republic of (South Korea)
Lebanon B & C only
Lesotho
Liechtenstein
Macau
Macedonia, Rep. of
Madagascar
Malaysia
Martinique
Mauritius
Mexico Spanish translation of list required; pre-registration advised
Moldova, Republic of
Mongolia B & C only
Montenegro
Morocco In theory, B only, but in practice will accept for A & C
Namibia
New Caledonia
New Zealand
Norway
Pakistan B & C only
Peru
Philippines
Puerto Rico
Qatar B only
Reunion Island
Russian Federation (Currently not permitted)
Saudi Arabia Exhinitions / trade fairs / meetings only; Carnet must be pre-registered with Saudi authorities
Senegal
Serbia
Singapore
South Africa
Sri Lanka
St Pierre and Miquelon
Swaziland
Switzerland
Taiwan Requires CPD Carnet (slightly different document, operationally identical)
Thailand
Tunisia B & C only
Turkey Only reps named on Carnet may sign; take goods list (in Excel format) on USB stick
Ukraine (Currently not permitted)
United Arab Emirates B only, must enter/exit through Dubai or Abu Dhabi
United States A & C only; if goods are in fact for exhibition (B), reclassify as C on Carnet
Wallis and Futuna Islands