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.

10 hosts · 302 ms

HostCertsFirst seenLast seenDNS
nttxstore.jp 1 2026-01-14 2026-01-14 ok
image.nttxstore.jp 1 2026-01-14 2026-01-14 ok
api.nttxstore.jp 1 2025-10-02 2025-10-02 nxdomain
*.api.nttxstore.jp 1 2025-10-02 2025-10-02 —
admin.nttxstore.jp 1 2025-10-02 2025-10-02 nodata
*.admin.nttxstore.jp 1 2025-10-02 2025-10-02 —
sp.nttxstore.jp 2 2025-10-02 2026-01-14 ok
*.sp.nttxstore.jp 1 2025-10-02 2025-10-02 —
www.nttxstore.jp 1 2025-10-02 2025-10-02 nodata
*.www.nttxstore.jp 1 2025-10-02 2025-10-02 —

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