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.

7 hosts · 293 ms

HostCertsFirst seenLast seen
sska.de 2 2026-04-17 2026-04-22
psd2-xs2a.sska.de 2 2025-08-20 2026-07-28
upload.sska.de 1 2025-11-18 2025-11-18
module.sska.de 2 2026-04-17 2026-04-22
mailing.sska.de 4 2026-04-20 2026-08-19
blog.sska.de 2 2026-04-07 2026-09-23
www.sska.de 2 2026-04-17 2026-04-22

Programmatic access: API GET /v1/hosts/sska.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/sska.de.