dnsleak.com runs a DNS leak test, a tool that checks whether your VPN is exposing your real IP address. It's been online since 2012, has a valid SSL certificate, and shows up clean on security blacklists – so it's not a scam site by any means. That said, this isn't a neutral testing ground. The homepage is dominated by an ad for Private Internet Access (PIA) VPN, framing the test results as a reason to sign up for that specific service. If you're wondering 'is dnsleak.com a scam', the answer is no, but you should know that its recommendations are not independent.
The bigger concern for a privacy-focused tool is the lack of transparency about who runs it. There's no contact page, no about page, and no company name listed anywhere. For a site that handles your IP address – even temporarily – that's worth noting. Most legitimate VPN review or test sites at least list a name or email. dnsleak.com doesn't. The privacy policy and terms are present, which is good, but without knowing who's behind the site, you can't fully vouch for how your data is handled. If you're using dnsleak.com just as a quick check, it's likely fine. But don't rely on it as your only source for deciding whether a VPN is trustworthy.