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 · 352 ms

HostCertsFirst seenLast seenDNS
image.oe.target.com 1 2026-01-14 2026-01-14 ok
click.oe.target.com 1 2026-05-13 2026-05-13 ok
pages.oe.target.com 1 2025-11-06 2025-11-06 ok
view.oe.target.com 4 2025-07-14 2026-08-21 ok

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