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.

6 hosts · 219 ms

HostCertsFirst seenLast seen
patioproductions.com 41 2026-04-17 2026-10-01
*.patioproductions.com 17 2026-04-17 2026-10-01
stage.patioproductions.com 2 2026-05-01 2026-05-01
account.patioproductions.com 5 2026-05-09 2026-09-06
test.patioproductions.com 4 2026-04-16 2026-08-14
www.patioproductions.com 17 2026-05-01 2026-09-26

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