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 · 243 ms

HostCertsFirst seenLast seenDNS
carmaxautofinance.com 7 2025-07-24 2026-09-28 ok
wwwqa.carmaxautofinance.com 27 2025-12-28 2026-10-06 ok
clicktracking.carmaxautofinance.com 4 2026-03-10 2026-09-02 ok
www.carmaxautofinance.com 7 2025-07-24 2026-09-28 ok

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