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.

14 hosts · 375 ms

HostCertsFirst seenLast seenDNS
redbullmobile.at 10 2026-04-14 2026-08-10 ok
zone.redbullmobile.at 3 2025-08-22 2026-08-17 ok
stage-zone.redbullmobile.at 2 2025-10-09 2026-08-11 ok
www.stage-zone.redbullmobile.at 2 2025-10-09 2026-08-11 nxdomain
www.zone.redbullmobile.at 3 2025-08-22 2026-08-17 nxdomain
rechnung.redbullmobile.at 1 2026-06-11 2026-06-11 ok
www.rechnung.redbullmobile.at 1 2026-06-11 2026-06-11 nxdomain
qm.redbullmobile.at 1 2026-02-08 2026-02-08 ok
shop.redbullmobile.at 1 2026-06-11 2026-06-11 ok
www.shop.redbullmobile.at 1 2026-06-11 2026-06-11 nxdomain
friends.redbullmobile.at 1 2025-12-06 2025-12-06 nodata
ticket.redbullmobile.at 3 2025-10-09 2026-10-02 ok
www.ticket.redbullmobile.at 3 2025-10-09 2026-10-02 nxdomain
www.redbullmobile.at 8 2026-04-14 2026-08-10 ok

Programmatic access, with DNS A records: API GET /v1/hosts/redbullmobile.at (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/redbullmobile.at.