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.

7 hosts · 251 ms

HostCertsFirst seenLast seen
netzwelt.de 5 2026-06-02 2026-09-30
*.netzwelt.de 1 2025-12-09 2025-12-09
area52.netzwelt.de 5 2026-06-01 2026-09-29
jobboard.netzwelt.de 2 2026-06-10 2026-06-10
cp.netzwelt.de 11 2026-04-22 2026-10-05
cmp.netzwelt.de 5 2026-06-02 2026-09-24
loader.netzwelt.de 10 2026-04-12 2026-10-07

Programmatic access: API GET /v1/hosts/netzwelt.de (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/netzwelt.de.