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 · 232 ms

Download CSV
HostCertsFirst seenLast seen
merkecht.nl 4 2026-06-08 2026-10-06
e.merkecht.nl 5 2026-04-28 2026-09-27
www.merkecht.nl 4 2026-06-08 2026-10-06

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