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 · 345 ms

HostCertsFirst seenLast seenDNS
kskhwd.de 4 2026-04-16 2026-10-02 ok
psd2-xs2a.kskhwd.de 1 2026-02-04 2026-02-04 nxdomain
upload.kskhwd.de 1 2026-05-26 2026-05-26 ok
module.kskhwd.de 4 2026-04-16 2026-10-02 ok
mailing.kskhwd.de 6 2026-06-03 2026-10-02 ok
www.kskhwd.de 4 2026-04-16 2026-10-02 ok

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