Domains · Website glossary

Second-level domain

Quick answer · What is Second-level domain?

A domain label immediately beneath a top-level domain in the DNS hierarchy.

IN PRACTICE

Second-level domain: an example

In example.com, example is the second-level label; in example.co.uk, co occupies that level.

KEEP IN MIND

The registrable part of a name is not always just the second-level label.

Put the idea to work

Frequently asked questions

What is a practical example of Second-level domain?

In example.com, example is the second-level label; in example.co.uk, co occupies that level.

Is the registrable name always the second-level label?

The registrable part of a name is not always just the second-level label.

Which concepts should I read alongside Second-level domain?

Top-level domain: The highest named level of the public domain hierarchy, immediately beneath the root.
Public suffix: A suffix under which users can register names, including some multi-label and platform-specific boundaries.