Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts and first/last seen dates.

22 hosts · 238 ms

HostCertsFirst seenLast seen
youi.com.au 4 2025-07-30 2026-06-29
*.youi.com.au 1 2026-02-05 2026-02-05
vpnuat1.youi.com.au 1 2026-05-08 2026-05-08
vpnuat2.youi.com.au 1 2026-05-08 2026-05-08
pipe.youi.com.au 3 2026-05-27 2026-09-11
www.pipe.youi.com.au 3 2026-04-29 2026-08-17
secure.youi.com.au 1 2026-05-08 2026-05-08
quote.youi.com.au 1 2026-04-21 2026-04-21
www.quote.youi.com.au 1 2026-04-21 2026-04-21
claims.youi.com.au 1 2026-04-21 2026-04-21
www.claims.youi.com.au 1 2026-04-21 2026-04-21
careers.youi.com.au 1 2026-05-09 2026-05-09
internalcareers.youi.com.au 1 2026-05-09 2026-05-09
payments.youi.com.au 1 2026-01-21 2026-01-21
vpnuat.youi.com.au 1 2026-05-08 2026-05-08
qt.youi.com.au 1 2026-05-08 2026-05-08
tfnswtest.youi.com.au 2 2025-06-12 2026-06-15
www.tfnswtest.youi.com.au 2 2025-06-12 2026-06-15
wwwtest.youi.com.au 12 2026-05-09 2026-09-05
tfnsw.youi.com.au 2 2025-06-12 2026-06-10
www.tfnsw.youi.com.au 2 2025-06-12 2026-06-10
www.youi.com.au 11 2026-02-05 2026-08-14

Programmatic access: API GET /v1/hosts/youi.com.au (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/youi.com.au.