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.

7 hosts · 248 ms

HostCertsFirst seenLast seenDNS
spk-ro-aib.de 1 2026-04-24 2026-04-24 ok
psd2-xs2a.spk-ro-aib.de 2 2025-08-14 2026-07-21 nxdomain
module.spk-ro-aib.de 1 2026-04-24 2026-04-24 ok
newsletter.spk-ro-aib.de 5 2026-04-26 2026-08-23 ok
pk.hausbankbonus.spk-ro-aib.de 1 2025-11-07 2025-11-07 ok
www.pk.hausbankbonus.spk-ro-aib.de 1 2025-11-07 2025-11-07 nxdomain
www.spk-ro-aib.de 1 2026-04-24 2026-04-24 ok

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