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.

5 hosts · 245 ms

HostCertsFirst seenLast seenDNS
kskbb.de 4 2026-03-27 2026-09-12 ok
psd2-xs2a.kskbb.de 2 2025-09-01 2026-08-05 nxdomain
module.kskbb.de 4 2026-03-27 2026-09-12 ok
newsletter.kskbb.de 5 2026-04-29 2026-08-27 ok
www.kskbb.de 4 2026-03-27 2026-09-12 ok

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