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.

3 hosts · 320 ms

HostCertsFirst seenLast seenDNS
columbiawealthservices.com 27 2025-07-24 2026-10-04 ok
autodiscover.columbiawealthservices.com 2 2025-08-20 2026-07-31 ok
www.columbiawealthservices.com 24 2025-08-15 2026-10-04 ok

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