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.

3 hosts · 275 ms

HostCertsFirst seenLast seen
*.secure-sketch.com 2 2025-12-19 2026-02-06
app.secure-sketch.com 1 2025-11-09 2025-11-09
www.secure-sketch.com 10 2026-04-23 2026-08-19

Programmatic access: API GET /v1/hosts/secure-sketch.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/secure-sketch.com.