Choosing a subdomain

Please follow the steps to set a custom domain in this order:
  1. 1.
    Choosing a subdomain (you are here)
Only subdomains can be used to serve your documentation. It's not possible to use an apex domain.
Here are some examples of what you could and could not choose — just replace with your own domain:
Domain type
Apex domain
www subdomain
Custom subdomain
Once you have chosen your custom domain, you're ready to move onto the next step: deciding where to set the custom domain.