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.

12 hosts · 278 ms

HostCertsFirst seenLast seen
theclose.com 15 2025-08-05 2026-09-25
*.theclose.com 10 2025-08-05 2026-09-25
staging.theclose.com 5 2026-05-03 2026-08-31
assets.staging.theclose.com 2 2025-07-09 2026-06-09
link.theclose.com 2 2026-07-14 2026-07-14
wp.theclose.com 5 2026-05-25 2026-09-22
courses.theclose.com 6 2026-04-16 2026-06-14
newsletters.theclose.com 2 2025-09-09 2026-08-10
assets.theclose.com 2 2025-07-07 2026-06-07
staging-assets.theclose.com 2 2025-07-09 2026-06-09
dev-assets.theclose.com 1 2025-07-08 2025-07-08
assets.dev.theclose.com 1 2025-07-09 2025-07-09

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