Domain Naming rules knowledge explanation

Because all levels of domain names on the Internet are managed separately by different agencies, the way in which each institution manages domain names differs from the rules for naming names. But the naming of domain names also has some common rules, mainly the following points:

First, the domain name can contain only the following characters:

1.26 English letters

2. "0,1,2,3,4,5,6,7,8,9" 10 digits

3. "-" (conjunction number in English)

Second, the domain name of the combination of characters rules:

1. In the domain name, do not distinguish between the case of English letters

2. For a domain name length is a certain limit of the CN under the rules of domain name:

A. Follow all common rules of domain name

Two, can only register three domain name, three domain name uses the letter (A-0z,a-z, the capitalization equivalent), the numeral (0-9) and the connector (-) to compose, each level domain name between uses the real point (.) Connection, the three-level domain name length must not exceed 20 characters;

Third, may not use, or limit the use of the following names (the following table lists some of the registration of such domain names need to provide the material):

1 the full name or abbreviation of administrative divisions at or above the county level (including county level) http://www.aliyun.com/zixun/aggregation/38595.html "> Official approval

2 registration contains "China", "CHINESE", "CN", "national" and so on by the relevant State departments (refers to the units at the ministerial level) formal approval

3 The names of other countries or regions known to the public, foreign geographical names and names of international organizations shall not be used

4 The name of the trade or the general name of the product shall not be used

5 The name of the enterprise or trademark which has been registered in China shall not be used

6 The name of the damage to the state, society or public interest shall not be used

7 The official approval of the relevant departments of the State (referring to the units above the ministerial level) and relevant official approval of the people's Government at or above (including county level) shall mean that the relevant institutions are to give a written document indicating that they agree to XXXX Unit registration XXX domain name. such as: To apply for beijing.com.cn domain name, the Beijing Municipal People's government to provide approval.