If you've come across rr4---sn-a5mlrnls.gvt1.com and are wondering whether it's a scam, here's the short answer: it's not a website at all. This is a server hostname owned by Google, likely part of the network that serves videos or other content for YouTube and Google Maps. The page itself returns a 404 error because there's no actual site hosted at this address — it's meant to be called by apps and services, not visited by people.
That means the usual warning signs for shady sites don't really apply here. There's no privacy policy because there's nothing to buy or sign up for. The SSL certificate is valid and current, the connection is fast, and the server isn't on any blacklist. All of this matches what you'd expect from a legitimate piece of Google's infrastructure. So if you see this domain in your network logs or as a referrer, there's nothing to worry about. It's just Google doing its thing.