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 · 212 ms

HostCertsFirst seenLast seen
rakuten.tw 4 2026-04-02 2026-09-04
*.rakuten.tw 4 2026-04-02 2026-09-04
shop.rakuten.tw 7 2025-09-17 2026-09-24
*.shop.rakuten.tw 7 2025-09-17 2026-09-24

Programmatic access: API GET /v1/hosts/rakuten.tw (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/rakuten.tw.