When you visit cna.st, you get nothing but a “Not Found” page. That alone tells you this isn't a working website you can rely on. The domain has been around since 2019 and is hosted on Amazon's cloud, so someone put real money into the infrastructure. But without any visible content, contact details, or ownership information, there's simply no reason to trust it as a legitimate service.
Most active websites — whether a business, blog, or forum — at least show you who they are and what they do. cna.st does neither. If you're searching for “cna.st reviews” to see if it's safe, the honest answer is that there's nothing here to review. The site is effectively abandoned. A domain that old could have been legitimate in the past, but its current state makes it useless to visitors. There's no scam to warn about, but also no reason to engage with it. If you landed here expecting a service, move on to an alternative that actually works and shows you who's behind it.