.cn, as the country code top-level domain (ccTLD) for the People's Republic of China, is managed by a branch of the Ministry of Industry and Information. The registry is maintained by China Internet Network Information Center (CNNIC).
The registry has created a set of predefined second-level domains for certain kinds of organizations and geographic locations. Any individual may register for second-level domain names under these conditions.
Here are some examples: ac.cn is for academic and research institutions, com.cn is for industrial, commercial, financial enterprises, and individuals. edu.cn is for educational institutions (usually universities and colleges).
Here are also examples for geographic locations: sh.cn is for Shanghai Municipality. bj.cn is for Beijing Municipality. tw.cn is for Taiwan Province.
.CN domain extension ranks #3 among all domain extensions, and #1 among all country-code extensions (ccTLDs). Currently, there are 12.4 Million registered .cn domain names. CNNIC is the registry of .cn extension.
The oldest (still exists) .cn domain name is agri.gov.cn, and it was registered on 05 January 1997.
The most popular .cn domain name is 360.cn. Its worldwide rank is 10.