Domain Trace

Pick a starting point

Everything runs in your browser using public DNS-over-HTTPS (Google, with Cloudflare as backup) and public certificate logs. No server, no sign-in.

What visitors see shows every public site (the domain, www and each subdomain) grouped by whether people can actually open it. Click one to see why. Technical shows every record and server: press + to reveal each level, right-click a node to open what sits under it, use Filters to show only certain journeys or item types, and walk a journey forwards and backwards with the trace player.