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Update: Subdomains and the Public Suffix List 0 Recommended Answers 0 Replies 61 Upvotes
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Please note this new process for sites that need subdomains to be reviewed separately (from the Help Center FAQ):

Are subdomains reviewed separately?
In general, no. The Ad Experience Report treats subdomains (example.website.com) and paths under the parent domains (website.com/example) as being part of the parent domain (website.com). However, if subdomains are on the public suffix list, they're reviewed separately.
Note that the Ad Experience Report does review top level domains (e.g., example.com and example.co.uk) separately.

What if my subdomains aren’t on the Public Suffix List, but need to be reviewed separately?
In some exceptional cases where the Public Suffix List is not a viable solution, you can request that we review specific subdomains separately from the rest of your domain.
  • You should only make a request if the Public Suffix List is not a viable solution. 
  • Requests will not be granted if the use case is found to be invalid.
  • If your request is granted, we’ll post the information publicly
  • This is a temporary program intended to give publishers time to evaluate alternative solutions. The program ends on July 31, 2020. 
Get started by filling out the Request to review subdomains separately form, and we’ll take it from there.
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