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.

9 hosts · 194 ms

HostCertsFirst seenLast seen
aoyama-card.co.jp 1 2025-12-23 2025-12-23
console.aoyama-card.co.jp 4 2026-04-18 2026-08-16
mail.aoyama-card.co.jp 4 2025-07-02 2026-07-31
www.mail.aoyama-card.co.jp 2 2025-07-02 2026-07-28
smtp.aoyama-card.co.jp 4 2025-07-02 2026-07-31
www.smtp.aoyama-card.co.jp 2 2025-07-02 2026-07-28
mailgw.aoyama-card.co.jp 1 2025-07-02 2025-07-02
www.mailgw.aoyama-card.co.jp 1 2025-07-02 2025-07-02
www.aoyama-card.co.jp 1 2025-12-23 2025-12-23

Programmatic access: API GET /v1/hosts/aoyama-card.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/aoyama-card.co.jp.