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 · 307 ms

HostCertsFirst seenLast seenDNS
spk-schaumburg.de 2 2025-12-22 2026-09-01 ok
psd2-xs2a.spk-schaumburg.de 2 2025-08-18 2026-07-27 nxdomain
module.spk-schaumburg.de 2 2026-01-12 2026-09-01 ok
mailing.spk-schaumburg.de 5 2026-05-09 2026-09-06 ok
www.spk-schaumburg.de 2 2026-01-12 2026-09-01 ok

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