Domain names with different suffixes have different meanings. Currently, the most popular domain name categories can be divided into international domain names and domestic domain names. The main difference between the two lies in the domain name division method and different management organizations. To explain what an international domain name is and what a domestic domain name is, we must start with the domain name system. There are currently three types of top-level domain names in the domain name system on the Internet: category top-level domain names, geographical top-level domain names, and new top-level domain names. They are introduced as follows:

The first category is the category top-level domain name. There are 7 of them, which are now commonly referred to as international domain names. Since the Internet originally originated in the United States, the earliest domain names did not have country identification. People divided them into several major categories according to their uses, and they ended with different suffixes: .com (for commercial companies); .net ( for network services); .org (for organizing associations, etc.); .gov (for government departments); .e (for educational institutions); .mil (for military fields); .int (for international organizations) ). The initial domain name system was also mainly used by the United States. Therefore, American companies, institutions, government departments, etc. used "international domain names". With the development of the Internet to the world, .e, .gov, and .mil are generally only used by the United States. In addition to the special domain names, the other three commonly used domain names, .com, .org, and .net, have become common around the world. Therefore, these domain names are often called "international domain names" and are still used by countries around the world.

The second category is the geographical top-level domain name, which has 243 country and region codes. For example, .CN represents China and .UK represents the United Kingdom (for details, see the global country/region top-level geographical domain name suffix). In this way, domain names with the .CN suffix are accordingly called "domestic domain names".

Similar to the suffix naming of international domain names, there are also second-level domains with different meanings under the .cn top-level domain name, which mainly include category domains and administrative areas. This is what is commonly referred to as the second-level domain name: you can Third-level domain names are registered under second-level domains such as .com.cn or .net.cn. Third-level domain names can be divided into two categories: category domain names and administrative domain names.

Category domain names are domain names divided according to the nature of the applicant organization, including:

AC scientific research institutions

COM industrial, commercial, financial and other enterprises

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EDU Educational Institution

GOV Government Department

NET Internet, Access Network Information Center (NIC) and Operations Center (NOC)

ORG various non-profit organizations

Administrative division domain names are divided according to various administrative divisions in China. Their division standards are based on the national standards issued by the former State Bureau of Technical Supervision, including "administrative divisions" There are 34 domain names, applicable to all provinces, autonomous regions, and municipalities in my country. For example, organizations in Beijing can choose a domain name such as cnnic.bj.cn.

The administrative region names of China’s 34 top-level domain names are:

BJ-Beijing; SH-Shanghai; TJ-Tianjin;

CQ-Chongqing City; HE-Hebei Province; SX-Shanxi 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;

TW-Taiwan; HK-Hong Kong; MO-Macau.

In addition, starting from December 2002, CNNIC opened the registration of second-level domain names under the domestic .cn domain name. Domain names can be registered directly under .CN. For example, the domestic domain name registered by Times Marketing is: emarketer .cn.

The third type of top-level domain name, also known as the "new top-level domain name", is an international top-level domain name that ICANN decided to use in November 2000 based on the development needs of the Internet. It is also the international top-level domain name that has been used since 2001. Contains 7 categories: biz, info, name, pro, aero, coop, museum. The first 4 are unrestricted domains, and the last 3 are restricted domains. For example, aero needs to be registered as an aviation company, museum needs to be a museum, and coop needs to be registered as a collective enterprise (non-investor control, no need to maximize profits). The meanings and registration management organizations of these seven top-level domain names are as follows:

.aero, dedicated to the air transport industry, is responsible for the Belgian International Aviation Telecommunications Technology Association (SITA);

.biz, A general domain name that can replace .com. The supervisory organization is JVTeam;

.coop is exclusive to commercial cooperatives and is managed by the National Cooperative Business Association (NCBA) in Washington;

. info, a general domain name that can replace .net, is managed by Afilias, a joint venture of 19 Internet domain name registration companies;

.museum, dedicated to museums, is supervised by the Museum Domain Name Management Association (MDMA);

.name is a dedicated domain name for personal websites, and is managed by the British "GlobeName Registry";

.pro is dedicated to professionals such as doctors and lawyers, and the supervisory agency is a company in Dublin, Ireland. Internet domain name company "Professional Registration" (RegistryPro).

Background information on why ICANN added 7 new domains:

Since the emergence of the international Internet in the 1980s, .com, .net, and .org have always been important to merchants and consumers. The three most popular gTLDs. In particular, the .com domain name accounts for more than 80% of generic top-level domains. For many years, NSI has had a monopoly on the registration and management of these three domains. In 1999, ICANN and the US Department of Commerce terminated this monopoly and introduced a competition mechanism at the REGISTRAR level. However, competition at the REGISTRY level is still not enough, resulting in the DNS system not improving significantly over the years. The REGISTRY of the new seven top-level domains was also selected in November 2000. Except for NSI having a small stake in the INFO domain REGISTRY, it has nothing to do with other major new domain REGISTRY. In this way, the launch of new top-level domains will introduce a competition mechanism in the REGISTRY industry. The new REGISTRY has improvements in terms of technology and operational mechanisms, such as: changing today’s situation where WHOIS is scattered in various REGISGTRARs and implementing the same WHOIS; domain name information (zonefile) and WHOIS query are updated globally in 5 minutes. Previously, under the .COM domain Requires 24 to 48 hours; higher system redundancy, security and authentication rigor. Seemingly recognizing the serious challenges posed by the new domain, the operator of the .com domain VerisignGlobalRegistryService (which merged with NSI in 2000) took the initiative to submit a new contract to ICANN (the new contract was officially approved by ICANN on April 2, 2001). It is proposed to invest 200 million US dollars in the next few years to strengthen the infrastructure construction under the .COM domain.

After reading these introductions about top-level domain names and domestic domain name suffixes, we can find that many domain name resources can be used, but for commercial companies, so far, the most common domain name is still .com , domestic enterprises or foreign enterprises with domestic operations generally register the .com.cn domain name at the same time. Since the development and registration of the .cn second-level domain name, domestic websites seem to prefer using the .cn domain name.

Domain name is the link between the enterprise and the Internet website. It has an important identification function like a brand and trademark. It is the "key" for visitors to access the enterprise website, and is the symbol of the enterprise's existence on the Internet. It is responsible for It serves the dual functions of marking the site and guiding the corporate site.

Domain name plays an important role in the e-commerce development of enterprises. It is known as the "global trademark" in the Internet era. A good domain name will greatly increase the visibility of the enterprise on the Internet.

Therefore, it is very important for enterprises to choose a good domain name.