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
oncoreorig.com 3 2025-09-26 2026-09-28 ok
dashboard.oncoreorig.com 6 2026-06-02 2026-09-30 ok
bimi.oncoreorig.com 5 2026-05-23 2026-09-20 ok
www.oncoreorig.com 2 2025-09-26 2026-09-28 ok

Programmatic access, with DNS A records: API GET /v1/hosts/oncoreorig.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/oncoreorig.com.