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 · 174 ms

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HostCertsFirst seenLast seen
smartbit.be 1 2026-06-30 2026-06-30
*.smartbit.be 1 2026-06-30 2026-06-30
plesk1.smartbit.be 3 2026-07-14 2026-09-12

Programmatic access: API GET /v1/hosts/smartbit.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/smartbit.be.