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 · 253 ms

HostCertsFirst seenLast seenDNS
spk-salem.de 4 2026-03-30 2026-09-15 ok
psd2-xs2a.spk-salem.de 2 2025-08-20 2026-07-28 nxdomain
module.spk-salem.de 4 2026-03-30 2026-09-15 ok
mailing.spk-salem.de 5 2026-05-27 2026-09-23 ok
www.spk-salem.de 4 2026-03-30 2026-09-15 ok

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