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.

6 hosts · 262 ms

HostCertsFirst seenLast seenDNS
redbullmobile.om 5 2025-11-18 2026-09-20 ok
*.redbullmobile.om 1 2026-02-24 2026-02-24 —
rubyportal.redbullmobile.om 1 2026-02-08 2026-02-08 ok
www.redbullmobile.om 4 2025-11-18 2026-09-20 ok
stage-www.redbullmobile.om 4 2025-11-18 2026-09-21 ok
www.stage-www.redbullmobile.om 4 2025-11-18 2026-09-21 nxdomain

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