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.

8 hosts · 289 ms

HostCertsFirst seenLast seenDNS
strato.fr 1 2025-11-06 2025-11-06 ok
acn2.strato.fr 6 2026-03-12 2026-08-12 ok
fjdmv6.strato.fr 1 2026-01-20 2026-01-20 ok
oc.strato.fr 1 2026-08-31 2026-08-31 ok
id.strato.fr 3 2026-05-05 2026-05-05 ok
config.strato.fr 2 2025-09-03 2026-08-25 ok
acn.strato.fr 6 2025-07-28 2026-06-28 ok
www.strato.fr 1 2025-11-06 2025-11-06 ok

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