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.

3 hosts · 221 ms

Download CSV
HostCertsFirst seenLast seen
juul.id 6 2026-03-06 2026-10-02
support.juul.id 4 2026-03-06 2026-08-06
www.juul.id 6 2026-03-06 2026-10-02

Programmatic access: API GET /v1/hosts/juul.id (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/juul.id.