What is the list of known host domains where subdomains come from different providers?

What is the list of known host domains where subdomains come from different providers?

I recall that there is a list of hosting domains that are known to have subdomains from different sources, as for example wix.com and appspot.com, built into browsers. For such domains, subdomains do not inherit trust from the domain.

I forget the name of the list. What is it called?