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 · 176 ms

HostCertsFirst seenLast seen
m2.em.clinique.jp 1 2026-05-29 2026-05-29
res2.em.clinique.jp 1 2026-05-29 2026-05-29
t2.em.clinique.jp 1 2026-05-29 2026-05-29

Programmatic access: API GET /v1/hosts/em.clinique.jp (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/em.clinique.jp.