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 · 232 ms

HostCertsFirst seenLast seenDNS
conpac.it 4 2026-05-26 2026-10-05 ok
app.conpac.it 1 2026-08-10 2026-08-10 ok
www.conpac.it 4 2026-05-26 2026-10-05 ok

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