The second-level domain name refers to the domain name under the top-level domain name, and the international top-level domain name refers to the online name of the domain name registrant; Under the national top-level domain name, it is a symbol indicating the registered enterprise category. The top-level domain name officially registered and operated by China in the Internet Information Center (Inter NIC) is CN, which is also the first-level domain name of China.
Under the top-level domain name, China's second-level domain names are divided into category domain names and administrative domain names. 6 domain names * * *, among which scientific research institutions use AC; Com industrial and commercial financial enterprises; edu； For educational institutions; Gov for government departments; Net; Internet information center and operation center; Org is a non-profit organization. There are 34 administrative domain names, corresponding to provinces, autonomous regions and municipalities directly under the central government.
Extended data
To obtain a second-level domain name, you have to apply to the management department of the corresponding top-level domain name. In the United States, this management department is the registration service group of the network information center.
Application forms can be submitted electronically or by the US Postal Service.
To apply for a domain name in Europe, please contact RIPE (European Domain Name) in mcsun.eu.net. Application forms for Europe, Japan and Asia can be obtained from rs.interactive.net. ?
To fill in the domain name registration form, you have to identify a technical contact and at least two hosts responsible for the domain name you applied for. (The DNS jargon for the word responsible is "authority". Of course, you have to choose a name that has not been used yet. The processing time of this form is about two weeks.
Baidu Encyclopedia-Secondary Domain Name