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 · 361 ms

HostCertsFirst seenLast seenDNS
spk-chemnitz.de 2 2025-12-22 2026-08-27 ok
psd2-xs2a.spk-chemnitz.de 1 2026-02-04 2026-02-04 nxdomain
cloud.spk-chemnitz.de 4 2026-06-08 2026-10-06 ok
module.spk-chemnitz.de 2 2026-01-09 2026-08-27 ok
aktuelles.spk-chemnitz.de 5 2026-05-08 2026-09-05 ok
www.spk-chemnitz.de 2 2026-01-09 2026-08-27 ok

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