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 B 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
Puerto Rico
Qatar B only
Reunion Island
Russian Federation (Currently not permitted)
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