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.

5 hosts · 308 ms

HostCertsFirst seenLast seen
secure-ment.com 15 2026-04-30 2026-09-29
*.secure-ment.com 10 2026-04-30 2026-09-29
staging2.secure-ment.com 1 2026-08-16 2026-08-16
staging3.secure-ment.com 1 2026-09-06 2026-09-06
www.secure-ment.com 5 2026-05-10 2026-09-06

Programmatic access: API GET /v1/hosts/secure-ment.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/secure-ment.com.