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 · 525 ms

HostCertsFirst seenLast seenDNS
sparkasse-erlangen.de 1 2026-04-22 2026-04-22 ok
psd2-xs2a.sparkasse-erlangen.de 2 2025-08-20 2026-07-28 nxdomain
module.sparkasse-erlangen.de 1 2026-04-22 2026-04-22 ok
mailing.sparkasse-erlangen.de 5 2026-05-04 2026-08-31 ok
www.sparkasse-erlangen.de 1 2026-04-22 2026-04-22 ok

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