Help Center/ Cloud Certificate Manager/ FAQs/ SSL Certificate Application and Purchase/ About Required Domain Name Details/ Domain-related Concepts
Updated on 2022-09-23 GMT+08:00
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Domain-related Concepts

  • 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.

    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.

    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, www.huaweicloud.com. 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.

    The following uses abc.huaweicloud.com as an example to describe the domain name hierarchy:

    .com is only a top-level domain.

    huaweicloud.com is a domain name containing two domain levels.

    abc.huaweicloud.com is a domain name containing three domain levels.