Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts, first/last seen and live DNS status.

18 hosts · 277 ms

HostCertsFirst seenLast seenDNS
douane.nl 5 2026-04-16 2026-08-19 ok
tarief.str4.acc.douane.nl 1 2025-12-01 2025-12-01 ok
mvt.exportvalidation.hsm.acc.douane.nl 1 2026-02-19 2026-02-19 nodata
adobe-analytics-dc.douane.nl 2 2026-02-19 2026-02-19 ok
exchangerate.douane.nl 1 2026-01-05 2026-01-05 ok
tarief.douane.nl 2 2025-08-26 2026-08-06 ok
nh.douane.nl 2 2025-12-09 2025-12-09 ok
werkenbij.douane.nl 3 2025-09-10 2026-09-08 ok
kennisbank.douane.nl 2 2026-04-08 2026-10-05 ok
mvt.exportvalidation.hsm.douane.nl 1 2026-02-19 2026-02-19 nodata
werken.douane.nl 3 2025-09-10 2026-09-08 ok
e.acc.videobellen.douane.nl 4 2026-05-18 2026-08-02 ok
e.videobellen.douane.nl 4 2026-05-18 2026-08-02 ok
validationcalculation.douane.nl 3 2025-08-26 2026-08-06 ok
bvinet.douane.nl 5 2026-05-08 2026-09-05 ok
exchangeratetest.douane.nl 1 2026-01-05 2026-01-05 ok
validationcalculationtest.douane.nl 2 2026-01-08 2026-01-08 ok
www.douane.nl 4 2026-04-16 2026-05-04 ok

Programmatic access, with DNS A records: API GET /v1/hosts/douane.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/douane.nl.