About

An apex domain is the domain name that:

• is composed of the two top-level label of a name (the first being the top level domain)
• does not contain a subdomain

For example: example.com is an apex domain.

Apex domains are also known as:

• base,
• bare,
• naked,
• apex,
• Origin
• registered
• domain apex
• second level domain name
• or zone apex.

The Root domain is not a apex domain

Usage

The main usage is to qualify relative name and makes them unique on an internet scope

The apex domain name can be found in:

• Host: In the Fully Qualified Domain Name (FQDN) of a host, the domain is the last part. If your host is called mycomputer.oups.gerardnico.local, the DNS Domain Name is oups.gerardnico.local.
• Email: In email address, the domain name is the name after the at sign.
• Url: Web - URL

Documentation / Reference

• DNS Terminology