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 · 333 ms

HostCertsFirst seenLast seenDNS
mentality.com 11 2026-04-13 2026-09-25 ok
whoop.mentality.com 6 2026-06-25 2026-08-23 ok
ambassador.mentality.com 3 2026-07-20 2026-09-19 ok
ops.mentality.com 6 2026-06-23 2026-08-21 ok
www.mentality.com 13 2026-04-11 2026-09-25 ok

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