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 · 201 ms

HostCertsFirst seenLast seen
naked-mobile.de 17 2026-04-25 2026-09-20
*.naked-mobile.de 8 2026-04-25 2026-09-17
dev.naked-mobile.de 9 2026-05-25 2026-09-20

Programmatic access: API GET /v1/hosts/naked-mobile.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/naked-mobile.de.