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.

9 hosts · 316 ms

HostCertsFirst seenLast seenDNS
marblism.com 5 2025-10-06 2026-09-06 ok
*.marblism.com 2 2025-10-06 2026-09-06 —
onboarding.marblism.com 5 2026-05-25 2026-09-28 ok
staging.marblism.com 2 2025-09-09 2026-08-10 ok
ai.marblism.com 4 2025-08-11 2026-07-13 ok
help.marblism.com 11 2026-05-27 2026-09-22 ok
shop.marblism.com 12 2026-04-07 2026-10-03 ok
news.marblism.com 2 2026-03-24 2026-08-24 ok
www.marblism.com 3 2026-06-03 2026-08-04 ok

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