What happens when you visit rr3---sn-p5qlsndk.gvt1.com? You get a plain Google 404 error page. That's because this subdomain isn't meant for public browsing — it's part of Google's internal infrastructure, likely used for content delivery or server routing. If you're wondering whether it's a scam, the short answer is no: Google owns the domain and the security setup is clean, with a valid certificate and no blacklist entries.
But there's also nothing useful here. No content, no contact information, no services. So while it's not dangerous, there's no reason to interact with it. If you found this link somewhere unexpected, it's probably a broken or misused URL. For most people, the best course is to ignore it and move on.