Is there a service or database dependent domains the most popular sites in the world?

For example vk.com there is a dependence on userapi.com
have google.com from gstatic.com
etc.

Is there any public database or service that keeps track of such dependencies for the Top100 popular world sites?
June 10th 19 at 16:59
2 answers
June 10th 19 at 17:01
it's not a public database and not the service. And google.com and gstatic.com owned by Google, and many other domains.
It infrastructure of a large web-based systems, and it will not be published. Sense to track these relationships is completely absent, as it is not intended for use by outsiders, and therefore unreliable, may change, and rely on is not necessary.
To rely on the public API
June 10th 19 at 17:03
the types of bases there, is in the form of services that allow more action

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