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.

6 hosts · 280 ms

HostCertsFirst seenLast seenDNS
themora.com 14 2026-05-03 2026-10-03 ok
*.themora.com 9 2026-05-29 2026-10-03 —
mailing.themora.com 5 2026-05-17 2026-09-13 ok
confirmation.themora.com 1 2026-09-14 2026-09-14 ok
reservations.themora.com 27 2025-11-14 2026-10-06 ok
www.themora.com 5 2026-05-03 2026-08-31 ok

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