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.

5 hosts · 311 ms

HostCertsFirst seenLast seenDNS
longino.it 6 2026-06-02 2026-09-15 ok
*.longino.it 1 2026-06-03 2026-06-03 —
b2b.longino.it 4 2026-04-11 2026-08-09 ok
mcstaging.b2b.longino.it 5 2026-06-16 2026-09-27 ok
www.longino.it 9 2026-04-11 2026-09-15 ok

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