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.

5 hosts · 374 ms

HostCertsFirst seenLast seenDNS
greatflorida.com 20 2026-05-13 2026-10-05 ok
*.greatflorida.com 20 2026-05-13 2026-10-05 —
blog.greatflorida.com 7 2026-04-28 2026-09-26 ok
email.gulfcoast.greatflorida.com 5 2026-05-22 2026-09-19 ok
nancy.greatflorida.com 4 2026-04-15 2026-08-13 ok

Programmatic access, with DNS A records: API GET /v1/hosts/greatflorida.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/greatflorida.com.