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.

9 hosts · 315 ms

HostCertsFirst seenLast seenDNS
cruisereizen.nl 1 2025-11-10 2025-11-10 ok
upload.cruisereizen.nl 5 2026-04-23 2026-08-21 ok
api.cruisereizen.nl 11 2026-04-17 2026-09-07 ok
track.cruisereizen.nl 4 2026-04-11 2026-09-10 ok
cdn.cruisereizen.nl 3 2026-05-15 2026-09-01 ok
mijn.cruisereizen.nl 13 2026-05-17 2026-09-16 ok
ss.cruisereizen.nl 5 2026-05-25 2026-09-22 ok
content.cruisereizen.nl 5 2026-04-26 2026-08-24 ok
www.cruisereizen.nl 1 2025-11-10 2025-11-10 ok

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