The first-level domain name is also called the top-level domain name, and the two have the same meaning.

Top-level domain name, also known as first-level domain name, common ones include ".com", ".org", ".net", ".cn", etc.

"Second-level domain name" is one level added before the first-level domain name, such as "baidu.com".

Domain names above the second-level domain name are collectively referred to as subdomain names and are not included in the category of "registered domain names".

According to ICANN, organizations can apply to register top-level domain names in one or two years.

Individuals can apply to register a second-level domain name.

The following names may not be used, or are restricted from use

1. Registration containing "CHINA", "CHINESE", "CN", "NATIONAL", etc. has been approved by relevant national departments (referring to ministerial level Officially approved by the above units)

2. Names of other countries or regions, foreign place names, and names of international organizations known to the public may not be used

3. Administrative divisions at or above the county level (including county level) The full name or abbreviation of the name has been officially approved by the relevant people's government at or above the county level (including county level)

4. Industry names or common names of goods may not be used

5. Others have registered in China Former enterprise names or trademark names shall not be used

6. Names that are harmful to the interests of the country, society or the public shall not be used

7. After approval by relevant national departments (referring to ministries) Formal approval by units at or above the county level) and formal approval by the relevant people's governments at or above the county level (including the county level) means that the relevant institutions must issue written documents expressing their consent for the XXXX unit to register the XXX domain name.