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.

2 hosts · 219 ms

HostCertsFirst seenLast seen
sogolytics-discovery.com 8 2026-02-26 2026-08-11
*.sogolytics-discovery.com 6 2026-04-16 2026-08-11

Programmatic access: API GET /v1/hosts/sogolytics-discovery.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/sogolytics-discovery.com.