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 · 262 ms

HostCertsFirst seenLast seen
newsletter.kaufland.pl 1 2025-07-29 2025-07-29
l.newsletter.kaufland.pl 7 2025-07-29 2026-09-07
x.newsletter.kaufland.pl 11 2025-07-29 2026-09-08

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