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 · 245 ms

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HostCertsFirst seenLast seen
toto.rakuten.co.jp 19 2025-09-11 2026-10-15
*.toto.rakuten.co.jp 2 2025-09-11 2026-08-20
winner.toto.rakuten.co.jp 15 2026-02-23 2026-10-15
pre-winner.toto.rakuten.co.jp 16 2026-02-27 2026-10-08

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