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.

3 hosts · 215 ms

HostCertsFirst seenLast seen
firadis.co.jp 5 2025-10-17 2026-10-05
image.mail.firadis.co.jp 1 2026-02-12 2026-02-12
www.firadis.co.jp 5 2025-10-17 2026-10-05

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