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 · 275 ms

HostCertsFirst seenLast seen
klarna.pt 11 2025-06-12 2026-09-10
*.klarna.pt 1 2025-11-17 2025-11-17
www.klarna.pt 11 2025-06-12 2026-09-10

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