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.

4 hosts · 284 ms

HostCertsFirst seenLast seen
inspark.com 30 2026-04-16 2026-10-10
*.inspark.com 30 2026-04-16 2026-10-10
www2.inspark.com 9 2026-04-19 2026-09-15
go.inspark.com 9 2026-04-19 2026-09-15

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