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 · 313 ms

Download CSV
HostCertsFirst seenLast seen
builtrobotics.com 29 2026-04-28 2026-10-08
*.builtrobotics.com 29 2026-04-28 2026-10-08
assets-transform.builtrobotics.com 4 2026-05-21 2026-06-23
assets.builtrobotics.com 4 2026-05-20 2026-06-22
mta-sts.builtrobotics.com 1 2025-12-09 2025-12-09

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