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 · 251 ms

HostCertsFirst seenLast seenDNS
sparkasse-dessau.de 2 2025-12-22 2026-08-27 ok
psd2-xs2a.sparkasse-dessau.de 2 2025-08-26 2026-08-03 nxdomain
web.sparkasse-dessau.de 1 2026-01-13 2026-01-13 ok
module.sparkasse-dessau.de 2 2026-01-09 2026-08-27 ok
mailing.sparkasse-dessau.de 5 2026-05-07 2026-09-05 ok
www.sparkasse-dessau.de 2 2026-01-09 2026-08-27 ok

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