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 · 207 ms

HostCertsFirst seenLast seenDNS
herner-sparkasse.de 4 2026-04-16 2026-10-06 ok
psd2-xs2a.herner-sparkasse.de 1 2026-05-26 2026-05-26 nxdomain
module.herner-sparkasse.de 4 2026-04-16 2026-10-06 ok
mailing.herner-sparkasse.de 5 2026-05-03 2026-08-31 ok
www.herner-sparkasse.de 4 2026-04-16 2026-10-06 ok

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