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 · 277 ms

HostCertsFirst seenLast seen
sogosurvey.com 1 2025-12-01 2025-12-01
*.sogosurvey.com 1 2025-12-01 2025-12-01
email.sogosurvey.com 2 2026-09-01 2026-09-01
success.sogosurvey.com 5 2026-06-07 2026-10-05
cx.sogosurvey.com 2 2026-01-25 2026-06-22

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