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 · 248 ms

HostCertsFirst seenLast seen
newsletter.kaufland.cz 1 2025-07-29 2025-07-29
l.newsletter.kaufland.cz 9 2025-07-29 2026-08-31
x.newsletter.kaufland.cz 9 2025-07-29 2026-09-01

Programmatic access: API GET /v1/hosts/newsletter.kaufland.cz (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/newsletter.kaufland.cz.