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What does cn mean in www.sina.com.cn?
CN, Internet domain name, national top-level domain name, stands for China national domain name. It is officially registered and operated by China Internet Information Center. CN domain name is the only English international top-level domain name managed by China in the world, and it is the Internet logo of China enterprises.

CN domain name registration principle: choose the domain name to be registered and the registration period, and follow the principle of "first application first registration". The longest registration period of a CN domain name is 10 year, and users can choose the registration period of the domain name (in "years").

Extended data:

CN domain names have the following advantages:

1, with remarkable marking function and value orientation.

After China's accession to the WTO, international exchanges have become increasingly frequent. If there is a CN domain name, China enterprises can better go international, and at the same time, foreign enterprises can better integrate into China. China enterprises have CN domain names, which can better attract users who are interested in China culture and China enterprises all over the world. The international company owns the CN domain name, which can tell users in China that this is a localization service website for the China market.

2. Apply the laws of China to fully protect the interests of users.

According to international practice, the law of the place where the domain name registration authority is located usually applies to the settlement of domain name disputes. Authorized by the Ministry of Information Industry, the registered organization of CN domain name is China Internet Information Center. Disputes over CN domain names will be settled by China institutions in accordance with the laws of China, so as to avoid the risks of international litigation when registering foreign domain names.

3. Full Chinese service to ensure users' right to know.

For the CN domain name, all services are in Chinese, from the policies and regulations of the registration authority, to the registration agreement signed by the user and the registration service agency, and then to all kinds of notices sent to the user by the registration service agency in the future, so that users can clearly know their rights and obligations.

Baidu encyclopedia-. Communication network (short for Communicating Net)