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 · 194 ms

HostCertsFirst seenLast seenDNS
sparkasse-am-niederrhein.de 4 2026-04-01 2026-09-17 ok
psd2-xs2a.sparkasse-am-niederrhein.de 2 2025-07-30 2026-06-22 nxdomain
module.sparkasse-am-niederrhein.de 4 2026-04-01 2026-09-17 ok
mailing.sparkasse-am-niederrhein.de 5 2026-05-08 2026-09-05 ok
www.sparkasse-am-niederrhein.de 4 2026-04-01 2026-09-17 ok

Programmatic access, with DNS A records: API GET /v1/hosts/sparkasse-am-niederrhein.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-am-niederrhein.de.