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 · 258 ms

HostCertsFirst seenLast seenDNS
bengen.com 47 2026-04-09 2026-10-03 ok
*.bengen.com 27 2026-04-09 2026-10-03 —
owners.bengen.com 8 2026-06-03 2026-08-18 ok
next.bengen.com 8 2026-04-10 2026-09-09 ok
www.bengen.com 9 2026-06-04 2026-10-01 ok

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