How do I obtain all (cdn server) addresses of a website?

How do I obtain all (cdn server) addresses of a website? I used several websites to resolve the dns and found that the IP addresses were not comprehensive. I didn't cover all cdn addresses. How can I find all cdn addresses? How do I obtain all (cdn server) addresses of a website?
I used several website IP addresses after dns resolution
The discovery is not comprehensive and does not cover all cdn
The problem is how to find all cdn addresses?

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How do I obtain all (cdn server) addresses of a website?
I used several website IP addresses after dns resolution
The discovery is not comprehensive and does not cover all cdn
The problem is how to find all cdn addresses?

Method 1: if it is not malicious, ask the website administrator of the other party for a chat. If cdn is built by themselves, you will know. If it is a third-party cdn, you can directly ask a third-party.
Method 2: Use multiple servers to resolve the dns of the target website. If you have enough probe points and the distribution is wide enough, it is also possible to detect all the addresses.
Method 3: blacklist the source server and write a script to view the access source...