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.

12 hosts · 228 ms

HostCertsFirst seenLast seen
cecil-mode.fr 12 2026-02-16 2026-08-29
mxa.cecil-mode.fr 8 2026-02-16 2026-09-23
integ-bc.cecil-mode.fr 10 2026-05-04 2026-08-30
prod.cecil-mode.fr 8 2026-05-04 2026-08-30
irl.prod.cecil-mode.fr 13 2026-04-17 2026-08-13
integ.cecil-mode.fr 8 2026-05-04 2026-08-30
ssgtm.cecil-mode.fr 6 2026-04-26 2026-08-22
integ.ssgtm.cecil-mode.fr 10 2026-04-21 2026-08-17
autodiscover.cecil-mode.fr 10 2026-05-11 2026-09-09
autodiscover.sav.cecil-mode.fr 10 2026-05-11 2026-09-09
dev.cecil-mode.fr 8 2026-04-21 2026-08-17
www.cecil-mode.fr 12 2026-02-16 2026-08-30

Programmatic access: API GET /v1/hosts/cecil-mode.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/cecil-mode.fr.