Com stands for domain name in www.com.net.
Net stands for domain name category in www.com.net, that is, top-level domain name used for network services.
At present, there are three types of top-level domains in the domain name system on the Internet: category top-level domains, regional top-level domains and new top-level domains. They are described as follows:
The first category is the category top-level domain name, with seven * * *, which is now commonly known as international domain. Because the Internet originated in the United States, the earliest domain name had no national logo. People divide them into several categories according to their uses, and they end with different suffixes:. Com (for commercial companies); . Net (for network services); . Org (used to organize associations, etc. ); . Gov (for government departments); . Edu (educational institution); . Mil (used in military field); . Int (for international organizations). The original domain name system was mainly used in the United States, so American enterprises, institutions and government departments all used "international domain". With the global development of Internet. edu。 The government and. Mil is generally only used in the United States, while the other three commonly used domain names,. com，。 Org and. Net, has been used all over the world, so this domain name is usually called "international domain" and is still used by countries all over the world.
The second category is geographical top-level domain names, such as * * * with 243 country and region codes. CN stands for China, and. UK stands for Britain (see the suffix of top-level geographical domain names in global countries/regions for details). In this way, with. CN suffix is called "domestic domain name" accordingly.
Similar to international domain's suffix naming, in. Cn top-level domain name mainly includes category domain and administrative region. This is the so-called second-level domain name: you can register a third-level domain name under the second-level domain name, for example. Com.cn or ... Net.cn, and the third-level domain names can be divided into two categories: category domain names and administrative domain names.
Category domain name is a domain name divided according to the nature of the applicant, including:
Exchange scientific research institutions
COM industrial, commercial, financial and other enterprises
EDU educational institutions
GOV government department
NET internet, connected to the network information center (NIC) and operation center (NOC).
ORG various non-profit organizations.
The domain names of administrative divisions are divided according to China's administrative divisions, and the division standards are determined according to the national standards issued by the former State Bureau of Technical Supervision, including 34 "domain names of administrative divisions", which are applicable to all provinces, autonomous regions and municipalities directly under the Central Government. For example, institutions in Beijing can choose a domain name like cnnic.bj.cn.
The administrative domain names of the 34 top-level domains in China are:
BJ- Beijing; SH- Shanghai; TJ- Tianjin;
CQ- Chongqing; He-Hebei Province; SX- Shaanxi province;
NM- Inner Mongolia Autonomous Region; Ln-Liaoning province; JL- Jilin Province;
HL- Heilongjiang Province; JS- Jiangsu province; ZJ- Zhejiang Province;
Ah-Anhui Province; FJ- Fujian province; JX- Jiangxi Province;
SD- Shandong Province; Ha-Henan province; HB- Hubei province;
HN- Hunan Province; GD- Guangdong Province; GX- Guangxi Zhuang Autonomous Region;
Hi-Hainan Province; SC- Sichuan Province; GZ- Guizhou province;
YN- Yunnan province; XZ- Xizang Autonomous Region; Sn-in Shaanxi Province;
GS- Gansu province; QH- Qinghai province; NX- Ningxia Hui Autonomous Region;
XJ- Xinjiang Uygur Autonomous Region;
TW- Taiwan Province Province; Hong Kong-Hong Kong; Macau mo.
In addition, from June 5438+February 2002, cnNIC opened the second-level domain name registration in China. CN domain name, can be directly registered in. CN domain name. For example, the domain name registered by Time Marketing in China is emarketer.cn.
The third type of top-level domain name, the so-called "new top-level domain name", is an international top-level domain name that ICANN decided to use from 200 1 according to the needs of Internet development, and it also includes seven categories: biz, info, Name, pro, aero, coop and museum. Among them, the first four are unrestricted domains and the last three are restricted domains. For example, aero needs to be registered as an airline, museum needs to be registered as a museum, and coop needs to be registered as a collective enterprise (not controlled by investors, not maximizing profits). The meanings of these seven top-level domains and their registration agencies are as follows:
SITA is responsible for Aero, which is dedicated to air transportation;
. Biz, it can be replaced. Com, supervised by JVTeam; ;
. Coop, dedicated to commercial cooperatives, is managed by the National Cooperative Business Association (NCBA) in Washington, DC;
. Info, it can be replaced. Net, which is under the responsibility of Afilias jointly established by 19 Internet domain name registration companies;
. Museums, which are exclusively used by museums and supervised by the Museum Domain Name Management Association (MDMA);
. Name, a private domain name for personal websites, is under the responsibility of the British Global Names Registry;
. Dear, doctor and lawyer, etc. The regulator is the online domain name company "RegistryPro Pro" in Dublin, Ireland.