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 · 224 ms

HostCertsFirst seenLast seen
q-click.jp 1 2025-12-17 2025-12-17
www.q-click.jp 1 2025-12-17 2025-12-17

Programmatic access: API GET /v1/hosts/q-click.jp (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/q-click.jp.