Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts and first/last seen dates.

5 hosts · 221 ms

HostCertsFirst seenLast seen
sparkasse-zollernalb.de 4 2026-03-27 2026-09-12
psd2-xs2a.sparkasse-zollernalb.de 1 2026-06-01 2026-06-01
module.sparkasse-zollernalb.de 4 2026-03-27 2026-09-12
mailing.sparkasse-zollernalb.de 5 2026-05-03 2026-08-31
www.sparkasse-zollernalb.de 4 2026-03-27 2026-09-12

Programmatic access: API GET /v1/hosts/sparkasse-zollernalb.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/sparkasse-zollernalb.de.