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 · 354 ms

HostCertsFirst seenLast seenDNS
cloud.mail.vontobel.com 1 2025-11-05 2025-11-05 ok
image.mail.vontobel.com 5 2025-08-23 2026-09-21 ok
click.mail.vontobel.com 2 2025-11-05 2025-11-05 ok
view.mail.vontobel.com 1 2025-11-05 2025-11-05 ok

Programmatic access, with DNS A records: API GET /v1/hosts/mail.vontobel.com (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.vontobel.com.