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 · 302 ms

HostCertsFirst seenLast seenDNS
sparkasse-wa-fkb.de 2 2026-04-21 2026-10-07 ok
psd2-xs2a.sparkasse-wa-fkb.de 2 2025-08-20 2026-07-27 nxdomain
module.sparkasse-wa-fkb.de 2 2026-04-21 2026-10-07 ok
mailing.sparkasse-wa-fkb.de 5 2026-05-09 2026-09-06 ok
www.sparkasse-wa-fkb.de 2 2026-04-21 2026-10-07 ok

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