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.

5 hosts · 265 ms

HostCertsFirst seenLast seenDNS
spk-rastatt-gernsbach.de 4 2026-03-30 2026-09-15 ok
psd2-xs2a.spk-rastatt-gernsbach.de 2 2025-08-14 2026-07-21 nxdomain
module.spk-rastatt-gernsbach.de 4 2026-03-30 2026-09-15 ok
mailing.spk-rastatt-gernsbach.de 5 2026-05-10 2026-09-07 ok
www.spk-rastatt-gernsbach.de 4 2026-03-30 2026-09-15 ok

Programmatic access, with DNS A records: API GET /v1/hosts/spk-rastatt-gernsbach.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/spk-rastatt-gernsbach.de.