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.

13 hosts · 256 ms

HostCertsFirst seenLast seen
slimster.nl 21 2025-06-27 2026-10-07
*.slimster.nl 21 2025-06-27 2026-10-07
mijn2.slimster.nl 10 2026-04-20 2026-08-17
inc-a.slimster.nl 3 2026-05-22 2026-09-08
inc.slimster.nl 11 2026-05-01 2026-10-01
dashboard.slimster.nl 3 2026-06-08 2026-08-26
e.slimster.nl 4 2026-04-19 2026-08-17
reporting.slimster.nl 10 2026-05-01 2026-10-03
track.slimster.nl 5 2026-05-28 2026-09-26
crm.slimster.nl 3 2026-07-27 2026-09-25
cdn.slimster.nl 1 2026-01-25 2026-01-25
go.slimster.nl 5 2026-05-26 2026-09-23
measurement.slimster.nl 3 2026-05-14 2026-08-31

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