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.

3 hosts · 265 ms

HostCertsFirst seenLast seenDNS
oteemofederal.com 18 2026-05-20 2026-10-06 ok
*.oteemofederal.com 7 2026-05-20 2026-10-06 —
www.oteemofederal.com 16 2026-06-02 2026-09-29 ok

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