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.

5 hosts · 223 ms

HostCertsFirst seenLast seenDNS
cloud.oe1.target.com 2 2025-08-10 2026-07-28 ok
image.oe1.target.com 1 2026-01-21 2026-01-21 ok
click.oe1.target.com 2 2025-08-10 2026-07-28 ok
pages.oe1.target.com 2 2025-08-10 2026-07-28 ok
view.oe1.target.com 17 2025-08-10 2026-08-21 ok

Programmatic access, with DNS A records: API GET /v1/hosts/oe1.target.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/oe1.target.com.