Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts, first/last seen and live DNS status.

5 hosts · 193 ms

HostCertsFirst seenLast seenDNS
stg.ad.jacard.cr.mufg.jp 2 2025-09-12 2026-08-13 ok
www.ad.jacard.cr.mufg.jp 2 2025-09-12 2026-08-13 ok
www.stg.jacard.cr.mufg.jp 2 2025-12-17 2025-12-17 ok
www.test.jacard.cr.mufg.jp 2 2025-09-12 2026-08-13 ok
www.jacard.cr.mufg.jp 3 2026-02-10 2026-02-10 ok

Programmatic access, with DNS A records: API GET /v1/hosts/jacard.cr.mufg.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/jacard.cr.mufg.jp.