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.

6 hosts · 245 ms

HostCertsFirst seenLast seen
spk-buehl.de 4 2026-03-30 2026-09-15
*.spk-buehl.de 5 2026-05-11 2026-09-08
psd2-xs2a.spk-buehl.de 1 2026-06-01 2026-06-01
module.spk-buehl.de 4 2026-03-30 2026-09-15
newsletter.spk-buehl.de 5 2026-04-25 2026-08-23
www.spk-buehl.de 4 2026-03-30 2026-09-15

Programmatic access: API GET /v1/hosts/spk-buehl.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-buehl.de.