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 · 328 ms

HostCertsFirst seenLast seen
ssl-test-5.com 6 2025-10-16 2026-09-16
hello.ssl-test-5.com 1 2026-08-12 2026-08-12
melanietestcontacts.ssl-test-5.com 1 2025-10-16 2025-10-16
test.ssl-test-5.com 1 2026-04-03 2026-04-03

Programmatic access: API GET /v1/hosts/ssl-test-5.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/ssl-test-5.com.