Basic Policy
Google AdSense requires you to register your top-level domain (e.g., example.com, any4u.xyz). Once this parent domain is approved, any subdomains (e.g., ko.example.com, blog.any4u.xyz) are automatically included and eligible for ad serving without separate registration.
- Registering the top-level domain allows you to display ads on all its subdomains—no need to add each subdomain separately.
- Attempting to register a subdomain that falls under an already registered parent domain will trigger a message such as “This domain is already registered.”
Key Points
- Registration: Only the root domain can be added and approved in AdSense’s site management.
- Subdomain Coverage: Once the parent domain is approved, all subdomains like ko.any4u.xyz or en.any4u.xyz are automatically covered and can show AdSense ads using the same code and account.
- No Redundant Registration: Subdomains cannot be registered individually once the parent domain is in the system; you will receive an error if you try.
- Policy Change: In the past, subdomains required separate review. Now, the process is unified at the top-level domain for simpler management.
Notes
- Only the root domain will appear in your site list or management screen.
- Subdomains are not listed or managed separately.
- If you place the AdSense code on your subdomain pages, ads will function as long as the main domain is approved.
In summary: Register your main domain in AdSense. All subdomains are included under the parent domain, and you do not need to register subdomains separately due to AdSense’s current domain management policy. If you see a message that a subdomain is already registered, it simply means the parent domain (and all of its subdomains) are already in your AdSense setup.