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How to distinguish the first-level domain name from the second-level domain name? Many novices are not very clear about this. In order to help you solve this problem, the following editor will explain it in detail. People with this need can come and learn. I hope you can gain something.

Distinguish between primary and secondary domain names, usually using the "." before the suffix of the domain name. Judging by the number, the domain name suffix does not have a ".", it is a first-class domain name, there is only one "." Is a second-level domain name.

The domain name consists of two or more groups of ASCII or national language characters, separated by periods, the rightmost character group is called the top-level domain name or the first-level domain name, the penultimate group is called the second-level domain name, the penultimate group is called the third-level domain name, and so on.

For example, yisu.com, a first-level domain name, does not have a "." before the domain name suffix ".cn"; www.yisu.com, a secondary domain name, has a "." before the domain name suffix ".cn", that is, news.west.

So is yisu.com/docs/ a second-level domain name?

It is not a second-level domain name. / docs/ belongs to the sub-page under yisu.com. The second-level domain name belongs to an independent domain name, while / docs/, exists based on yisu.com.

How can domain names such as .com.cn and .gov.cn judge secondary domain names?

.com.cn, .gov.cn, etc., belong to secondary domains and are domain name suffixes as a whole. When we calculate, we need to put ".com.cn", ".gov.cn", etc., and .com, .cn, etc., into a hierarchical calculation.

For example, the official website of the Ministry of Industry and Information Technology is "www.miit.gov.cn", in which ".gov.cn" is a whole; miit.gov.cn belongs to the first-level domain name; www.miit.gov.cn belongs to the second-level domain name.

For example, the Sichuan Provincial Communications Administration, http://scca.miit.gov.cn/, where the domain name suffix is ".gov.cn", the first-level domain name is "miit.gov.cn" and the second-level domain name is "scca.miit.gov.cn".

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