Domain-related Concepts

Updated on 2024-06-18 GMT+08:00

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Wildcard domain
A wildcard domain is a domain name that contains only one * and starts with *..

For example, *.a.com is a correct wildcard domain name, but *.*.a.com is not.

NOTE:

A wildcard domain name counts as one domain name. For details about the mapping between a domain name and a wildcard domain name, see What Domains Can Wildcard-Domain Certificates Support?

Common domain name
A common domain name is a specific domain name or a non-wildcard domain name.

For example, www.a.com or a.com is a common domain name.

The number of common domain names that can be associated depends on the number of domain names selected in your order.

NOTE:

For example, buy.example.com counts as one domain name and next.buy.example.com would count as a separate domain name.

Domain levels

A domain name is composed of one or more domain levels separated by periods (.), for example, . The hierarchy of domains descends from the right to the left label in the name.

A top-level domain is the highest level in the domain name hierarchy. A second-level domain is directly below a top-level domain. Table 1 details the domain levels.

**Table 1** Domain Level
Parameter	Description
Top-level domain	The highest level in the domain name hierarchy. All domain names include a top-level domain suffix. Top-level domains include generic top-level domains (such as .com, .net, and .org), international/regional top-level domains (such as .us, .cn, and .tk), and new generic top-level domains (such as .info and .biz).
Second-level domain	A second-level domain is directly below a top-level domain. For example, in example.com, example is the second-level domain.
Third-level domain	A third-level domain is directly below a second-level domain. For example, in www.example.com, www is the third-level domain.
You can add a new domain level to the left of the last level.

Parent topic: About Required Domain Name Details

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