Platform limitation: Certglimpse cannot inspect a host that is itself behind Cloudflare — the platform will not open a socket back into its own network. Such hosts will report as unreachable. This is not a finding about your server. Try github.com (reachable) and example.com (Cloudflare-fronted, unreachable from here).
Chain
Subject Alternative Names (SANs)
Certglimpse reports only what the server actually presented on the wire. If a field is absent, it is shown as absent — no values are inferred. This is a one-shot diagnostic; no monitoring, no alerts, no re-checks.