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.

6 hosts · 328 ms

Download CSV
HostCertsFirst seenLast seen
socialbroker.com 9 2025-10-15 2026-07-30
*.socialbroker.com 6 2025-10-15 2026-07-14
staging.socialbroker.com 3 2026-07-30 2026-09-28
api.socialbroker.com 3 2026-07-30 2026-09-28
internal.socialbroker.com 7 2026-07-30 2026-09-30
www.socialbroker.com 2 2026-07-30 2026-07-30

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