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 · 333 ms

HostCertsFirst seenLast seenDNS
einforma.com 2 2025-07-16 2026-08-03 ok
*.einforma.com 2 2025-07-16 2026-08-03 —
cdn.einforma.com 2 2026-02-27 2026-08-03 ok
www.einforma.com 1 2025-11-18 2025-11-18 ok

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