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.

3 hosts · 247 ms

Download CSV
HostCertsFirst seenLast seen
ed-admin.com 15 2026-04-23 2026-10-15
*.ed-admin.com 14 2026-04-23 2026-10-15
www.ed-admin.com 1 2026-08-26 2026-08-26

Programmatic access: API GET /v1/hosts/ed-admin.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/ed-admin.com.