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 · 180 ms

Download CSV
HostCertsFirst seenLast seen
nikki.ne.jp 5 2025-09-04 2026-09-09
*.nikki.ne.jp 5 2025-09-04 2026-09-09
stg.nikki.ne.jp 2 2026-01-27 2026-09-01
*.stg.nikki.ne.jp 2 2026-01-27 2026-09-01

Programmatic access: API GET /v1/hosts/nikki.ne.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/nikki.ne.jp.