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.

10 hosts · 387 ms

HostCertsFirst seenLast seenDNS
ksp.de 1 2026-02-16 2026-02-16 ok
*.ksp.de 1 2026-02-16 2026-02-16 —
karriere.ksp.de 2 2026-08-27 2026-08-27 ok
wartung.ksp.de 4 2026-04-18 2026-08-16 ok
serviceportal.ksp.de 1 2026-02-16 2026-02-16 ok
*.serviceportal.ksp.de 1 2026-02-16 2026-02-16 —
intern.ksp.de 1 2026-03-03 2026-03-03 nodata
*.intern.ksp.de 1 2026-03-03 2026-03-03 —
ad.intern.ksp.de 1 2026-03-03 2026-03-03 nodata
*.ad.intern.ksp.de 1 2026-03-03 2026-03-03 —

Programmatic access, with DNS A records: API GET /v1/hosts/ksp.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/ksp.de.