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.

4 hosts · 246 ms

HostCertsFirst seenLast seenDNS
min-fx.jp 3 2025-07-18 2026-07-21 ok
*.min-fx.jp 4 2025-07-18 2026-07-21 —
lp.min-fx.jp 3 2026-05-25 2026-09-08 ok
help.min-fx.jp 5 2026-05-21 2026-09-19 ok

Programmatic access, with DNS A records: API GET /v1/hosts/min-fx.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/min-fx.jp.