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 · 250 ms

HostCertsFirst seenLast seenDNS
cloud.ouchi-eneos.com 2 2026-04-18 2026-09-19 ok
image.ouchi-eneos.com 3 2026-01-21 2026-05-05 ok
click.ouchi-eneos.com 3 2026-04-18 2026-09-19 ok
view.ouchi-eneos.com 2 2026-04-18 2026-09-19 ok

Programmatic access, with DNS A records: API GET /v1/hosts/ouchi-eneos.com (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/ouchi-eneos.com.