The domain name consists of two or more words separated by a dot, and the rightmost word is called the top-level domain. The top-level domain we encounter can be divided into two categories: one is the country and regional top-level domain. Currently, more than 200 countries have been assigned top-level domains according to ISO3166 country codes, such as cn for China, jp for Japan, etc.; the other is the international top-level domain, such as .com for commercial enterprises, .net for network providers, .org for non-profit organizations, etc.

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