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.

6 hosts · 247 ms

HostCertsFirst seenLast seen
zugucase.com 17 2026-02-28 2026-10-02
*.zugucase.com 1 2026-02-28 2026-02-28
i2.zugucase.com 5 2026-06-14 2026-08-16
i.zugucase.com 3 2026-05-05 2026-08-20
checkout.zugucase.com 18 2026-05-21 2026-09-30
www.zugucase.com 19 2026-05-22 2026-09-30

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