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.

4 hosts · 229 ms

HostCertsFirst seenLast seenDNS
cloud.mail.lene.it 2 2025-08-08 2026-07-29 ok
image.mail.lene.it 2 2026-05-28 2026-06-25 ok
click.mail.lene.it 3 2025-09-23 2026-09-21 ok
view.mail.lene.it 2 2025-08-08 2026-07-29 ok

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