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 · 341 ms

HostCertsFirst seenLast seen
rightsdefend.com 1 2025-10-10 2025-10-10
*.rightsdefend.com 1 2025-10-10 2025-10-10
portal.rightsdefend.com 4 2026-06-05 2026-10-03

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