Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts, first/last seen and live DNS status.

3 hosts · 233 ms

HostCertsFirst seenLast seenDNS
896.co.jp 1 2025-11-05 2025-11-05 ok
*.896.co.jp 8 2025-11-05 2026-09-19 —
www-f.896.co.jp 41 2025-07-03 2026-06-18 ok

Programmatic access, with DNS A records: API GET /v1/hosts/896.co.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/896.co.jp.