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 · 276 ms

HostCertsFirst seenLast seenDNS
cloud.mail.news-doppelganger.it 1 2025-11-06 2025-11-06 ok
image.mail.news-doppelganger.it 5 2026-03-05 2026-09-21 ok
click.mail.news-doppelganger.it 1 2026-01-27 2026-01-27 ok
view.mail.news-doppelganger.it 1 2026-01-27 2026-01-27 ok

Programmatic access, with DNS A records: API GET /v1/hosts/news-doppelganger.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/news-doppelganger.it.