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 · 194 ms

HostCertsFirst seenLast seen
sogolytics.io 2 2026-05-19 2026-08-15
www.sogolytics.io 1 2026-05-20 2026-05-20

Programmatic access: API GET /v1/hosts/sogolytics.io (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.io.