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 · 244 ms

HostCertsFirst seenLast seenDNS
bocconialumni.it 3 2026-06-08 2026-07-22 ok
office.bocconialumni.it 3 2026-03-30 2026-07-22 ok
eventi.bocconialumni.it 1 2025-11-28 2025-11-28 ok
outlook.bocconialumni.it 3 2026-03-30 2026-07-22 ok
tr.bocconialumni.it 3 2026-05-03 2026-10-03 ok
*.tr.bocconialumni.it 3 2026-05-03 2026-10-03 —
t.bocconialumni.it 2 2025-09-08 2026-08-09 ok
*.t.bocconialumni.it 2 2025-09-08 2026-08-09 —
www.bocconialumni.it 1 2026-06-08 2026-06-08 ok

Programmatic access, with DNS A records: API GET /v1/hosts/bocconialumni.it (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/bocconialumni.it.