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.

7 hosts · 206 ms

HostCertsFirst seenLast seen
winna.com 25 2026-04-30 2026-09-27
*.winna.com 25 2026-04-30 2026-09-27
affiliate.winna.com 8 2026-05-02 2026-08-28
*.staging.winna.com 6 2026-05-06 2026-09-01
link.winna.com 5 2026-04-15 2026-08-13
link.info.winna.com 6 2026-04-28 2026-08-24
careers.winna.com 10 2026-05-23 2026-09-24

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