Because domain names at all levels on the Internet are managed by different organizations, the methods of domain name management and the rules of domain name naming are also different. However, there are some general rules for naming domain names, mainly as follows:
The domain name can only contain the following characters:
1.26 English letters
2. Ten numbers "0, 1, 2, 3, 4, 5, 6, 7, 8, 9"
3. "-"(English conjunction)
Second, the combination rules of characters in the domain name:
1. In a domain name, English letters are case-insensitive.
2. The length of the domain name is limited.
The rules for naming domain names under cn are:
First of all, follow all the general rules of domain name naming.
2. Only the third-level domain name can be registered. The third-level domain name consists of letters (a-0z, a-z, case equivalence), numbers (0-9) and connectors (-), and real dots (. ), and the length of the third-level domain name shall not exceed 20 characters;
3. The following names shall not be used or restricted (the following table lists some materials that need to be provided when registering such domain names):
1) The registration includes "China", "China", "cn" and "Nationality".
Approved by the relevant state departments (units above ministerial level)
2) The names of other countries or regions, foreign place names and international organizations that are well known to the public shall not be used.
3) the full name or abbreviation of the name of the administrative division at or above the county level (including the county level)
The relevant people's governments at or above the county level (including the county level) formally approved it.
4) Trade names or generic names of commodities shall not be used.
5) Do not use the enterprise name or trademark name registered by others in China.
6) Do not use names that are harmful to the national, social or public interests.
7) The official approval of the relevant state departments (units above ministerial level) and relevant people's governments above county level (including county level) means that the relevant institutions need to give written documents to express their consent to the registration of xxx domain names by xxxx units. For example, if you want to apply for a domain name in beijing.com.cn, you must provide the approval of the Beijing Municipal People's Government.