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.

12 hosts · 250 ms

HostCertsFirst seenLast seenDNS
dalt.fr 14 2025-06-16 2026-09-13 ok
*.dalt.fr 1 2026-06-29 2026-06-29 —
emailing.dalt.fr 5 2026-05-17 2026-09-13 ok
trail.dalt.fr 7 2026-05-02 2026-09-07 ok
n8n.dalt.fr 2 2025-08-17 2026-07-18 ok
sonar.dalt.fr 4 2025-07-27 2026-07-18 ok
skills.dalt.fr 3 2026-02-25 2026-07-28 ok
assets.dalt.fr 2 2026-06-29 2026-06-29 ok
contentboost.dalt.fr 1 2025-10-22 2025-10-22 ok
staging.contentboost.dalt.fr 1 2025-10-22 2025-10-22 ok
test-webflow.dalt.fr 1 2025-06-16 2025-06-16 nxdomain
www.dalt.fr 14 2025-06-16 2026-09-14 ok

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