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.

10 hosts · 254 ms

HostCertsFirst seenLast seen
gpsea.fr 1 2026-01-27 2026-01-27
*.gpsea.fr 1 2026-01-27 2026-01-27
topten2025.gpsea.fr 9 2026-04-15 2026-09-28
ida.gpsea.fr 3 2026-05-10 2026-09-22
micollab.gpsea.fr 2 2026-05-26 2026-05-26
phototheque.gpsea.fr 5 2026-05-04 2026-09-01
t.emploi.gpsea.fr 5 2026-06-07 2026-10-05
outlook.gpsea.fr 6 2026-05-21 2026-08-19
email.gpsea.fr 4 2026-04-12 2026-08-10
matomo-com.gpsea.fr 5 2026-06-01 2026-09-29

Programmatic access: API GET /v1/hosts/gpsea.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/gpsea.fr.