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 · 294 ms

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HostCertsFirst seenLast seen
projectjune.de 5 2026-05-19 2026-09-06
en.projectjune.de 8 2026-05-15 2026-09-10
members.projectjune.de 5 2026-06-07 2026-10-05
www.projectjune.de 6 2026-05-24 2026-09-21

Programmatic access: API GET /v1/hosts/projectjune.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/projectjune.de.