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 · 258 ms

HostCertsFirst seenLast seenDNS
powersolutions.co.jp 1 2026-05-12 2026-05-12 ok
static.powersolutions.co.jp 1 2026-05-26 2026-05-26 ok
mta-sts.powersolutions.co.jp 1 2026-05-26 2026-05-26 ok
www.powersolutions.co.jp 1 2026-05-12 2026-05-12 ok

Programmatic access, with DNS A records: API GET /v1/hosts/powersolutions.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/powersolutions.co.jp.