TLS certificate check

Hostname

One hostname at a time. Port 443 only. Cloudflare note: Hosts behind Cloudflare are reachable — the inspection runs from a real machine, not the edge.

Try with these hostnames

github.com         - valid chain, 3 certificates
wikipedia.org     - valid chain, 4 certificates
incomplete-chain.badssl.com  - leaf only (intermediate missing)
expired.badssl.com            - expired certificate
nonexistent-domain-xyz.example  - hostname that does not resolve