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.

6 hosts · 314 ms

HostCertsFirst seenLast seenDNS
sparkasse-muensterland-ost.de 4 2026-04-14 2026-10-05 ok
psd2-xs2a.sparkasse-muensterland-ost.de 1 2026-05-26 2026-05-26 nxdomain
module.sparkasse-muensterland-ost.de 4 2026-04-14 2026-10-05 ok
mail.sparkasse-muensterland-ost.de 5 2026-04-30 2026-08-27 ok
jobs.sparkasse-muensterland-ost.de 23 2026-06-08 2026-10-06 ok
www.sparkasse-muensterland-ost.de 4 2026-04-14 2026-10-05 ok

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