Find every subdomain
of a domain.

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

4 hosts · 310 ms

HostCertsFirst seenLast seen
roofvents.com 11 2026-05-16 2026-09-28
account.roofvents.com 13 2026-04-14 2026-08-25
dev.roofvents.com 9 2025-12-19 2026-08-14
review.roofvents.com 3 2026-02-09 2026-07-07

Programmatic access: API GET /v1/hosts/roofvents.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/roofvents.com.