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.

3 hosts · 246 ms

HostCertsFirst seenLast seenDNS
risoprincipe1910.it 5 2026-05-28 2026-09-25 ok
mail.risoprincipe1910.it 4 2026-09-23 2026-09-23 ok
www.risoprincipe1910.it 5 2026-05-28 2026-09-25 ok

Programmatic access, with DNS A records: API GET /v1/hosts/risoprincipe1910.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/risoprincipe1910.it.