What Is A Subdomain – Forbes Advisor

Subdomains are a type of domain that is part of another domain. For example, if you’ve ever read a WordPress blog, you might have noticed that the domain (or URL) is the name of the blog dot worddpress.com (blogname.wordpress.com). In this case, wordpress.com is the domain and blogname.wordpress.com is the subdomain. Subdomains can be used for a number of reasons, from prototyping sites to using two different themes.

Follow along to learn more on exactly what a subdomain is, as well as when to use a subdomain, its impact on search engine optimization and how to set one up through your domain name registrar or web host.

Subdomain Definition

A subdomain is an extension or add-on to your business domain name. Subdomains are used to organize different functional parts of the website.

Say you have a domain name yoursite.com. You can have subdomains such as blog.yoursite.com or store.yoursite.com so that your store and blog can be designed, organized and optimized independently from your main website. As you continue adding different functions to your domain website, you can use new subdomains to separate them from the main website.

The URLs of domain names and subdomains are treated as separate entities—which brings us to the question of how a subdomain appears in the domain URL.

Structure of a Subdomain

The subdomain is appended before your domain name to create a new URL. Once this URL is created, it can have pages of its own as with any website.

Characteristics and Parameters of a Subdomain

Here are some important things to know about a subdomain:

  • A domain can have up to 500 subdomains
  • You can create multiple levels of subdomains such as store.product.yoursite.com, test.forum.yoursite.com, etc.
  • Each subdomain can be up to 255 characters long, but for multi level subdomains, each level can only be 63 characters long

How To Create a Subdomain

The process of setting up a subdomain will vary slightly depending on where your subdomain is registered. However, generally the process to create a subdomain will look something like the following:

Here’s how to set up a subdomain:

  • Navigate to your domain name registrar or web host (eg, Bluehost or DreamHost)
  • Select domains from your account dashboard
  • Find and select subdomains
  • Create your new subdomain

For more information, visit your domain registrar or web hosting provider’s help center for detailed instructions on how to create a subdomain. Additionally, your provider should be able to assist further via support should you have any issues along the way.

Subdomain vs Subdirectory

There is some confusion around subdomains vs subdirectories, and rightfully so. The two are seemingly very similar, yet each has a different structure, site organization and impact on SEO. A subdirectory uses folders under the primary domain name to organize content on your website. A key difference is that subdomains are treated as separate websites and do not inherit any domain authority of the parent website. Its SEO has to be built from scratch.

Subdomains vs subdirectories at a glance:

  • Subdomain: blog.yoursite.com
  • Subdirectory: yoursite.com/blog

Both subdirectories and subdomains have their own advantages and disadvantages, and ultimately it’s your decision what your website needs.

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