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 · 295 ms

HostCertsFirst seenLast seenDNS
autodiscover.careplus-hp.com 3 2026-06-05 2026-08-21 ok
email.communications.careplus-hp.com 5 2026-05-17 2026-09-14 ok
pws.careplus-hp.com 6 2025-07-10 2026-09-12 ok
qa-pws.careplus-hp.com 5 2025-07-28 2026-08-18 ok

Programmatic access, with DNS A records: API GET /v1/hosts/careplus-hp.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/careplus-hp.com.