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.

6 hosts · 299 ms

Download CSV
HostCertsFirst seenLast seen
werkzoeken.nl 15 2026-05-11 2026-10-08
*.werkzoeken.nl 14 2026-05-11 2026-10-08
static.werkzoeken.nl 5 2026-05-12 2026-09-09
cdn.werkzoeken.nl 5 2026-05-12 2026-09-09
sst.werkzoeken.nl 5 2026-05-29 2026-09-27
www.werkzoeken.nl 1 2026-10-07 2026-10-07

Programmatic access: API GET /v1/hosts/werkzoeken.nl (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/werkzoeken.nl.