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 · 304 ms

HostCertsFirst seenLast seen
klarna.be 11 2025-06-12 2026-09-10
click.klarna.be 2 2026-01-21 2026-08-26
www.klarna.be 11 2025-06-12 2026-09-10

Programmatic access: API GET /v1/hosts/klarna.be (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/klarna.be.