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.

9 hosts · 270 ms

HostCertsFirst seenLast seenDNS
*.cloudslab.rubrikgov.com 1 2026-04-08 2026-04-08 —
sso.rubrikgov.com 10 2026-05-02 2026-10-04 ok
vpn-sso.rubrikgov.com 4 2026-03-11 2026-08-26 ok
status.rubrikgov.com 5 2026-05-02 2026-08-28 ok
support.rubrikgov.com 1 2026-04-10 2026-04-10 ok
my.rubrikgov.com 1 2025-12-18 2025-12-18 nodata
*.my.rubrikgov.com 1 2025-12-18 2025-12-18 —
prod.my.rubrikgov.com 1 2025-12-18 2025-12-18 nodata
*.prod.my.rubrikgov.com 1 2025-12-18 2025-12-18 —

Programmatic access, with DNS A records: API GET /v1/hosts/rubrikgov.com (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/rubrikgov.com.