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 · 315 ms

HostCertsFirst seenLast seen
stack.playwire.com 23 2026-05-22 2026-09-19
wrapper-fe.stack.playwire.com 18 2026-05-06 2026-09-02
clerk.stack.playwire.com 12 2026-05-23 2026-09-18
accounts.stack.playwire.com 9 2026-05-23 2026-09-18

Programmatic access: API GET /v1/hosts/stack.playwire.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/stack.playwire.com.