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 · 234 ms

HostCertsFirst seenLast seenDNS
cloud.mbfs-email.com 2 2025-07-17 2026-07-04 ok
image.mbfs-email.com 4 2025-06-11 2026-09-06 ok
click.mbfs-email.com 2 2025-07-15 2026-07-03 ok
view.mbfs-email.com 2 2025-07-15 2026-07-02 ok

Programmatic access, with DNS A records: API GET /v1/hosts/mbfs-email.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/mbfs-email.com.