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.

3 hosts · 194 ms

HostCertsFirst seenLast seen
cinestudio.paris 5 2026-06-02 2026-09-15
mta-sts.cinestudio.paris 5 2026-05-16 2026-09-14
www.cinestudio.paris 5 2026-05-28 2026-09-10

Programmatic access: API GET /v1/hosts/cinestudio.paris (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/cinestudio.paris.