How to know what IP will provide our pages in Gitlab Page?

We want to use a CRM with a frontend page which will be provided by Gitlab Pages.

So, in order to securize our communication we want to know if the the content will be provided from this IP: 35.185.44.232 (IP got from this documentation GitLab.com settings | GitLab), or it will be provided from a ranges of IP, specifically: 34.74.90.64/28 and 34.74.226.0/24 (ranges gotten from this documentation GitLab.com settings | GitLab)