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.

8 hosts · 545 ms

HostCertsFirst seenLast seenDNS
sparkasse-herford.de 5 2026-04-16 2026-10-05 ok
psd2-xs2a.sparkasse-herford.de 2 2025-08-06 2026-06-26 nxdomain
module.sparkasse-herford.de 5 2026-04-16 2026-10-05 ok
mailing.sparkasse-herford.de 5 2026-05-26 2026-09-22 ok
voting.sparkasse-herford.de 1 2025-12-29 2025-12-29 ok
adventskalender.sparkasse-herford.de 1 2025-11-17 2025-11-17 ok
events.sparkasse-herford.de 1 2025-12-29 2025-12-29 ok
www.sparkasse-herford.de 5 2026-04-16 2026-10-05 ok

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