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.

5 hosts · 206 ms

HostCertsFirst seenLast seen
studiotk.com 4 2026-06-10 2026-10-08
rewards.studiotk.com 1 2025-10-10 2025-10-10
dev-rewards.studiotk.com 1 2026-02-12 2026-02-12
view.studiotk.com 10 2026-05-16 2026-09-11
www.studiotk.com 2 2026-06-25 2026-06-25

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