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 · 245 ms

HostCertsFirst seenLast seen
sparkasse-re.de 5 2026-04-16 2026-10-05
psd2-xs2a.sparkasse-re.de 2 2025-08-25 2026-07-29
module.sparkasse-re.de 5 2026-04-16 2026-10-05
newsletter.sparkasse-re.de 2 2025-12-09 2025-12-09
www.sparkasse-re.de 5 2026-04-16 2026-10-05

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