Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts and first/last seen dates.

4 hosts · 298 ms

HostCertsFirst seenLast seen
cloud.email.caprabo.es 3 2026-03-22 2026-08-24
image.email.caprabo.es 3 2026-01-05 2026-02-12
click.email.caprabo.es 3 2026-03-22 2026-08-23
view.email.caprabo.es 3 2026-03-22 2026-08-24

Programmatic access: API GET /v1/hosts/email.caprabo.es (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/email.caprabo.es.