If you've come across rr1---sn-ab5l6nkd.gvt1.com and wondered whether it's safe, you're probably looking at a backend server, not a website you'd visit directly. This subdomain belongs to Google's infrastructure network (gvt1.com) and returns a simple 404 error page. It has no privacy policy, contact info, or branding — exactly what you'd expect from a CDN or service endpoint that's never meant to be browsed.
For a technical server, security is well handled: a valid SSL certificate, modern encryption, and protection against clickjacking. The domain isn't blacklisted and is hosted entirely on Google's own network. So is rr1---sn-ab5l6nkd.gvt1.com legit? Yes, as far as its intended purpose goes. There's no scam risk, because there's nothing here to scam you with — no checkout page, no login form, no data collection. Reviews of this subdomain are irrelevant since it's not a business.
The most important takeaway: don't treat this like a typical website. It's a piece of internet plumbing, and it's functioning exactly as designed.