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 · 191 ms

HostCertsFirst seenLast seen
jpn-web.co.jp 5 2026-05-10 2026-09-07
staff.jpn-web.co.jp 5 2026-05-14 2026-09-11
www.staff.jpn-web.co.jp 5 2026-05-14 2026-09-11
recruit.jpn-web.co.jp 5 2026-05-14 2026-09-11
www.recruit.jpn-web.co.jp 5 2026-05-14 2026-09-11
recruit-test.jpn-web.co.jp 5 2026-05-13 2026-09-11
www.recruit-test.jpn-web.co.jp 5 2026-05-13 2026-09-11
www.jpn-web.co.jp 5 2026-05-10 2026-09-07

Programmatic access: API GET /v1/hosts/jpn-web.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/jpn-web.co.jp.