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 · 295 ms

HostCertsFirst seenLast seenDNS
wadax.ne.jp 4 2025-08-28 2026-09-07 ok
*.wadax.ne.jp 4 2025-07-10 2026-06-10 —
mta-sts.wadax.ne.jp 4 2026-05-12 2026-10-01 ok
www.wadax.ne.jp 3 2025-08-28 2026-09-07 ok

Programmatic access, with DNS A records: API GET /v1/hosts/wadax.ne.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/wadax.ne.jp.