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 · 181 ms

HostCertsFirst seenLast seen
arche-gruppe.de 2 2025-09-04 2026-08-05
*.arche-gruppe.de 2 2025-09-04 2026-08-05

Programmatic access: API GET /v1/hosts/arche-gruppe.de (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/arche-gruppe.de.