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.

3 hosts · 267 ms

Download CSV
HostCertsFirst seenLast seen
smartschool.be 1 2026-05-04 2026-05-04
*.smartschool.be 1 2026-05-04 2026-05-04
status.smartschool.be 6 2026-04-28 2026-08-25

Programmatic access: API GET /v1/hosts/smartschool.be (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/smartschool.be.