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 · 228 ms

HostCertsFirst seenLast seen
akhlds.co.jp 2 2025-09-17 2026-09-15
stage.akhlds.co.jp 6 2026-06-01 2026-10-01
kansetsukoubai.akhlds.co.jp 7 2025-06-25 2026-07-21
www.akhlds.co.jp 2 2025-09-17 2026-09-15

Programmatic access: API GET /v1/hosts/akhlds.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/akhlds.co.jp.