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.

7 hosts · 571 ms

HostCertsFirst seenLast seenDNS
kasseler-sparkasse.de 1 2026-04-22 2026-04-22 ok
psd2-xs2a.kasseler-sparkasse.de 1 2026-05-22 2026-05-22 nxdomain
module.kasseler-sparkasse.de 1 2026-04-22 2026-04-22 ok
finanzierungsantrag.kasseler-sparkasse.de 2 2025-09-25 2026-08-26 ok
mailing.kasseler-sparkasse.de 5 2026-05-08 2026-09-06 ok
datentransfer.kasseler-sparkasse.de 9 2026-04-16 2026-09-08 ok
www.kasseler-sparkasse.de 1 2026-04-22 2026-04-22 ok

Programmatic access, with DNS A records: API GET /v1/hosts/kasseler-sparkasse.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/kasseler-sparkasse.de.