AT
Austria
ISO 3166 Country Code
Europe
Country Codes
Alpha-2 Code (ISO 3166-1 alpha-2)
AT
Alpha-3 Code (ISO 3166-1 alpha-3)
AUT
Numeric Code (ISO 3166-1 numeric)
040
Common Usage
HTML lang attribute
<html lang="at">
URL locale parameter
https://example.com/at/
JavaScript/TypeScript
const country = "AT"; const countryName = "Austria";
API Response (JSON)
{
"country": "AT",
"countryName": "Austria",
"alpha3": "AUT",
"numeric": "040"
}ISO 3166 Standard
ISO 3166 is the international standard for country codes. The alpha-2 code (AT) is the most commonly used format for domain names, language tags, and internationalization. The alpha-3 code (AUT) is used in shipping, banking, and official documents. The numeric code (040) is language-independent and useful for systems with character encoding limitations.