If you ran across us-b4-p-e-cg11.cdn.mdstrm.com and wondered whether it's a real site or something shady, the short answer is that it's neither. This hostname is a content delivery network (CDN) edge server operated by MediaStream, a Chilean CDN provider. It doesn't host a website you can visit or buy from — it's the backend infrastructure that delivers video or other large files to your browser when you watch content from a site that uses MediaStream.
For a CDN node, the signals we checked are all positive. The connection uses modern encryption, the server is not on any blacklists, and Google's security tools see no threats. The lack of an about page, contact info, or legal documents is perfectly normal — these servers aren't meant to communicate with end users. The parent domain mdstrm.com is a known business, so the ownership chain is clear.
There's no reason to treat this hostname as a scam or a risk. If you're checking whether a video or stream you're watching is legitimate, look at the source website instead. The CDN itself is just a delivery pipe, and this one appears to be running as expected.