.cn is the country code top-level domain (ccTLD) for the People's Republic of China.

Entities connected to Hong Kong, Macau, and Taiwan typically use .hk, .mo, and .tw, respectively,[5] despite the availability of corresponding second-level domains under .cn for those regions.

According to the "China Internet Domain Name System" published by the Ministry of Industry and Information Technology, there are 9 generic second-level domains, two of which are internationalized:[6] The two-letter abbreviations correlate with ISO 3166-2 "Codes for the representation of names of countries and their subdivisions—Part 2: Country subdivision code" (adapted locally as National Standard GB/T 2659.2[7]).

On 25 June 2010, ICANN approved the use of the internationalized country code top-level domains ".中国" (China in simplified Chinese characters, DNS name xn--fiqs8s) and ".中國" (China in traditional Chinese characters, DNS name xn--fiqz9s) by CNNIC.

However, these have not been recognized by ICANN yet and are only available via domestic domain name registrars.