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.

6 hosts · 164 ms

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HostCertsFirst seenLast seen
keiba.rakuten.co.jp 3 2025-09-10 2026-08-20
*.keiba.rakuten.co.jp 3 2025-09-10 2026-08-20
auction.keiba.rakuten.co.jp 17 2026-02-23 2026-10-15
stg-auction.keiba.rakuten.co.jp 4 2026-03-26 2026-06-23
bet.keiba.rakuten.co.jp 11 2026-04-13 2026-10-15
my.keiba.rakuten.co.jp 14 2025-09-10 2026-10-15

Programmatic access: API GET /v1/hosts/keiba.rakuten.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/keiba.rakuten.co.jp.