Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts, first/last seen and live DNS status.

10 hosts · 285 ms

HostCertsFirst seenLast seenDNS
icna.fr 6 2026-05-12 2026-09-27 ok
old.icna.fr 2 2026-09-27 2026-09-28 ok
maintenance.icna.fr 5 2026-05-12 2026-09-09 ok
cal.icna.fr 5 2026-05-12 2026-09-09 ok
mail.icna.fr 6 2026-05-12 2026-09-27 ok
admin.icna.fr 3 2026-06-12 2026-08-11 ok
gestion.icna.fr 5 2026-05-12 2026-09-09 ok
adherent.icna.fr 3 2026-06-12 2026-08-11 ok
www.icna.fr 6 2026-05-12 2026-09-27 ok
my.icna.fr 6 2026-05-12 2026-09-27 ok

Programmatic access, with DNS A records: API GET /v1/hosts/icna.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/icna.fr.