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.

4 hosts · 215 ms

Download CSV
HostCertsFirst seenLast seen
modiform.nl 8 2025-12-15 2026-09-27
*.modiform.nl 1 2025-12-15 2025-12-15
werkenbij.modiform.nl 4 2026-06-13 2026-10-12
www.modiform.nl 5 2026-05-30 2026-09-27

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