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.

8 hosts · 228 ms

HostCertsFirst seenLast seen
cuenote.ne.jp 5 2026-04-30 2026-08-28
otp1.cuenote.ne.jp 4 2025-07-22 2026-07-09
www.otp1.cuenote.ne.jp 4 2025-07-22 2026-07-09
otp2.cuenote.ne.jp 4 2025-07-22 2026-07-09
www.otp2.cuenote.ne.jp 4 2025-07-22 2026-07-09
support-fc.cuenote.ne.jp 5 2026-05-09 2026-09-06
docs.cuenote.ne.jp 5 2026-04-30 2026-08-31
www.cuenote.ne.jp 5 2026-04-30 2026-08-28

Programmatic access: API GET /v1/hosts/cuenote.ne.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/cuenote.ne.jp.