Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts and first/last seen dates.

4 hosts · 294 ms

HostCertsFirst seenLast seen
promodirect.com 1 2025-09-30 2025-09-30
blog.promodirect.com 1 2025-10-05 2025-10-05
enews.promodirect.com 14 2026-04-24 2026-08-21
www.promodirect.com 1 2025-09-30 2025-09-30

Programmatic access: API GET /v1/hosts/promodirect.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/promodirect.com.