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 · 193 ms

HostCertsFirst seenLast seen
synergie-insertion.fr 5 2025-12-08 2026-08-24
conservation-donnees-personnelles.synergie-insertion.fr 6 2026-05-04 2026-08-30
www.synergie-insertion.fr 7 2025-12-08 2026-09-27

Programmatic access: API GET /v1/hosts/synergie-insertion.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/synergie-insertion.fr.