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.

9 hosts · 262 ms

HostCertsFirst seenLast seen
collegedeparis.fr 15 2026-04-30 2026-09-16
*.collegedeparis.fr 15 2026-04-30 2026-09-16
formation-continue.collegedeparis.fr 4 2026-05-16 2026-07-16
forms-international.collegedeparis.fr 9 2026-04-15 2026-08-14
forms-inter-admission.collegedeparis.fr 14 2026-05-08 2026-09-05
info.collegedeparis.fr 2 2026-05-12 2026-05-12
analytics.collegedeparis.fr 2 2026-05-16 2026-05-16
mta-sts.collegedeparis.fr 2 2026-02-03 2026-06-30
www.collegedeparis.fr 4 2026-04-25 2026-06-25

Programmatic access: API GET /v1/hosts/collegedeparis.fr (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/collegedeparis.fr.