●SNI Tester

peek under the hood of any domain's TLS handshake

🔐

Enter a domain to inspect its TLS certificate.

Data sourced live from Certificate Transparency logs.

🔎 Transparency note: Certificate data is pulled from public Certificate Transparency logs (crt.sh). Browsers cannot open raw TLS sockets, so live socket-level SNI negotiation and reachability are best-effort / inferred — we won't fake a green checkmark we can't prove.

Remix on Berrry • built with honesty and a 🤝