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.

5 hosts · 216 ms

HostCertsFirst seenLast seen
licence.fff.eu 9 2026-06-04 2026-09-30
infos.fff.eu 13 2026-06-04 2026-09-30
actus.fff.eu 15 2026-06-04 2026-09-30
l.contact.fff.eu 11 2026-05-26 2026-09-21
x.contact.fff.eu 8 2026-05-25 2026-09-20

Programmatic access: API GET /v1/hosts/fff.eu (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/fff.eu.