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 · 238 ms

HostCertsFirst seenLast seen
sogolytics-ask.com 9 2026-02-24 2026-10-09
*.sogolytics-ask.com 7 2026-04-17 2026-10-09

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