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 · 272 ms

HostCertsFirst seenLast seen
ceufast.com 8 2025-10-10 2026-09-17
*.ceufast.com 1 2025-10-27 2025-10-27
ai.ceufast.com 1 2025-08-13 2025-08-13
www.ceufast.com 8 2025-10-10 2026-09-17

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