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.

2 hosts · 217 ms

HostCertsFirst seenLast seen
maschinensucher.net 5 2026-05-23 2026-09-21
www.maschinensucher.net 5 2026-05-23 2026-09-21

Programmatic access: API GET /v1/hosts/maschinensucher.net (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/maschinensucher.net.