03Aug, 2017
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Domain names are composed of at least two levels, a top-level domain and a second-level domain. The top-level domain, also referred to as TLD, is the extension attached to Internet domain names. There are a…

What are third level domain names?

Domain names are composed of at least two levels, a top-level domain and a second-level domain. The top-level domain, also referred to as TLD, is the extension attached to Internet domain names. There are a limited number of predefined TLDs, such as .com, .net, .biz, .org and .co.

The second-level domain name includes the top-level domain and the domain name itself. For example, “microsoft.com” is a second-level domain, as it includes the domain name “microsoft” and the top-level domain “.com.”

The third-level domain name is used to refer to different servers within different departments of a company. In larger organizations each division or department might have its own third level domain, which can serve as an effective means for identifying it. www is the default third-level domain name and the most commonly used. The third level domains are not mandatory unless the user has a specific requirement.

For example: www.furniture.net is a third-level domain. .net is a top-level domain and furniture is the domain name. The www is third-level domain.

Third level domains should not be confused with the part of e-mail addresses that appears to the left of the  at (@) symbol. Thus, for example, the support in support@furniture.net  is not a third level domain, but rather is merely a specific addressee or mailbox at an Internet address.

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