If that web page has a video element, CDN Finder will see the URL in that element's source and identify the CDN. The CDN Finder tool analyzes the HTML of a web page. The All New CDN Finder Does CDN Finder identify CDN for streaming video?
Read more about how CDN Finder identifies a CDN in our blog post:
In short, CDN Finder uses DNS, response headers and IP-to-ASN mappings to identify the CDN.
