Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts, first/last seen and live DNS status.

8 hosts · 279 ms

HostCertsFirst seenLast seenDNS
mysticsense.com 18 2026-01-01 2026-10-05 ok
*.mysticsense.com 18 2026-01-01 2026-10-05 —
grafana.mysticsense.com 1 2026-08-12 2026-08-12 ok
flower-prod.mysticsense.com 1 2026-08-12 2026-08-12 nxdomain
dashboard.mysticsense.com 5 2026-05-26 2026-09-23 ok
email.mail.mysticsense.com 5 2026-04-25 2026-08-23 ok
flower.mysticsense.com 1 2026-08-12 2026-08-12 ok
www.mysticsense.com 5 2026-05-26 2026-09-23 ok

Programmatic access, with DNS A records: API GET /v1/hosts/mysticsense.com (API key for paging).

Shown here: hostnames with a certificate that is valid now or expired within the last 90 days. The full history since 2013 — hostnames whose last certificate expired earlier — is a Pro plan method: GET /v1/hosts-history/mysticsense.com.