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.

1 host · 270 ms

HostCertsFirst seenLast seen
san1.grapefruitdesk.com 3 2026-06-11 2026-08-11

Programmatic access: API GET /v1/hosts/san1.grapefruitdesk.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/san1.grapefruitdesk.com.