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.

20 hosts · 213 ms

HostCertsFirst seenLast seen
pietrastudio.com 2 2025-11-16 2026-01-05
*.pietrastudio.com 2 2025-11-16 2026-01-05
store.pietrastudio.com 15 2026-05-17 2026-09-25
*.ff.pietrastudio.com 3 2025-10-15 2026-09-15
seg.pietrastudio.com 8 2026-05-15 2026-09-11
salesloft-tracking.pietrastudio.com 5 2026-05-29 2026-09-26
billing.pietrastudio.com 5 2026-06-04 2026-10-02
metabase.internal.pietrastudio.com 1 2026-01-27 2026-01-27
cloudrun.pietrastudio.com 3 2026-05-26 2026-09-11
faq.pietrastudio.com 6 2026-04-16 2026-09-13
builder.pietrastudio.com 4 2026-05-02 2026-06-30
dagster.pietrastudio.com 1 2026-01-27 2026-01-27
*.dagster.pietrastudio.com 1 2026-01-27 2026-01-27
get.pietrastudio.com 8 2026-05-10 2026-07-08
test.pietrastudio.com 6 2026-05-17 2026-05-31
dev.pietrastudio.com 5 2026-05-11 2026-09-07
*.dev.pietrastudio.com 5 2026-05-11 2026-09-08
try.pietrastudio.com 14 2026-05-19 2026-09-14
proxy.pietrastudio.com 3 2026-05-03 2026-08-31
*.proxy.pietrastudio.com 3 2026-05-03 2026-08-31

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