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 · 245 ms

HostCertsFirst seenLast seenDNS
propertymatrix.com 21 2025-08-19 2026-09-06 ok
*.propertymatrix.com 2 2025-08-19 2026-09-06 —
gtm.propertymatrix.com 3 2026-05-20 2026-09-07 ok
help.propertymatrix.com 10 2026-05-20 2026-09-15 ok
www.propertymatrix.com 22 2026-04-18 2026-08-15 ok

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