How many levels are domain names divided into?
DomainCn
Domain names are generally divided into different levels such as primary, secondary, and tertiary.
1. Top-level domain names
Country and region top-level domain names (ccTLD)
1. This is a top-level domain name based on a country or region code, used to indicate the country or region to which the domain name belongs. For example, .cn represents China, .us represents the United States, and .jp represents Japan. This type of domain name helps to clarify the geographical attributes of the website and is very meaningful for websites targeting users in a specific country or region.
2. Generic top-level domain names (gTLD)
Like .com (commercial organization), .org (non-profit organization), .net (network service organization), .edu (educational institution, mainly used in educational institutions in the United States), etc. They are not limited to a specific country and are widely used worldwide. Among them, .com is currently the most widely used generic top-level domain name, and many commercial companies use it.
2. Second-level domain name (Second-Level Domain)
The second-level domain name is a domain name created under the top-level domain name. For example, under the .com top-level domain name, baidu.com is a second-level domain name. For an enterprise or organization, the second-level domain name is usually its main network identity, which can be used to distinguish different business departments or projects. For example, mail.qq.com is the second-level domain name used by Tencent for email services. Different second-level domain names can point to different servers or network services.
3. Third-level domain names and multi-level domain names
1. Third-level domain names are further subdivided based on the second-level domain name. For example, in news.sina.com.cn, news is the third-level domain name. The third-level domain name can divide the website content or service area more specifically.
2. Multi-level domain names. As the complexity of network applications increases, domain names can have more levels. In theory, they can be continuously subdivided as needed to accurately locate specific resources or services within the website. However, too many levels of domain names may cause the domain name to be too long, affecting user memory and use.
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