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 · 228 ms

HostCertsFirst seenLast seenDNS
spked.de 1 2026-04-22 2026-04-22 ok
psd2-xs2a.spked.de 2 2025-07-10 2026-06-05 nxdomain
module.spked.de 1 2026-04-22 2026-04-22 ok
mailing.spked.de 5 2026-05-22 2026-09-20 ok
www.spked.de 1 2026-04-22 2026-04-22 ok

Programmatic access, with DNS A records: API GET /v1/hosts/spked.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/spked.de.