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.

5 hosts · 239 ms

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HostCertsFirst seenLast seen
slzorg.nl 6 2026-05-25 2026-09-22
oud.slzorg.nl 5 2026-05-14 2026-09-11
intranet.slzorg.nl 4 2026-06-05 2026-09-19
sociaalintranet.slzorg.nl 5 2026-04-22 2026-09-28
www.slzorg.nl 1 2026-05-27 2026-05-27

Programmatic access: API GET /v1/hosts/slzorg.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/slzorg.nl.