CN
China
ISO 3166 Country Code
Asia
Country Codes
Alpha-2 Code (ISO 3166-1 alpha-2)
CN
Alpha-3 Code (ISO 3166-1 alpha-3)
CHN
Numeric Code (ISO 3166-1 numeric)
156
Common Usage
HTML lang attribute
<html lang="cn">
URL locale parameter
https://example.com/cn/
JavaScript/TypeScript
const country = "CN"; const countryName = "China";
API Response (JSON)
{
"country": "CN",
"countryName": "China",
"alpha3": "CHN",
"numeric": "156"
}ISO 3166 Standard
ISO 3166 is the international standard for country codes. The alpha-2 code (CN) is the most commonly used format for domain names, language tags, and internationalization. The alpha-3 code (CHN) is used in shipping, banking, and official documents. The numeric code (156) is language-independent and useful for systems with character encoding limitations.