If you insert an absolute link to third-party content into your site, what IP will be visible in the storage of that content?

Question

Computer networks

Conventionally, there is a picture, but it can be anything, css, iframe, video, and so on.
The user enters the site, third-party content should be displayed and the client browser starts to pull it up.
Does the browser use the IP of the domain on which the link is (your site), or the IP of the client to pull content from the link?
An elementary example, any iframe for embedded video code from YouTube, what will be in the yuti logs?
Will there be a difference between iframe and mp3 for example?
Why?
You can’t test it locally, you need to set up 2 sites for verification - it takes a long time. Perhaps there are those who checked?

Answer 1

client's address, of course.
but the domain can be burned by the referrer.