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.

6 hosts · 343 ms

HostCertsFirst seenLast seenDNS
usenext.de 62 2025-06-20 2026-09-30 ok
*.usenext.de 62 2025-06-20 2026-09-30 —
high2.usenext.de 5 2026-04-17 2026-09-02 ok
email.mg.usenext.de 23 2026-05-30 2026-09-28 ok
auth.radius.usenext.de 24 2026-06-04 2026-09-30 ok
api.radius.usenext.de 24 2026-06-04 2026-09-30 ok

Programmatic access, with DNS A records: API GET /v1/hosts/usenext.de (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/usenext.de.