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 · 344 ms

Download CSV
HostCertsFirst seenLast seen
cookiescalifornia.com 16 2026-05-29 2026-10-11
*.cookiescalifornia.com 16 2026-05-29 2026-10-11
go.cookiescalifornia.com 3 2026-05-26 2026-09-11
pay.cookiescalifornia.com 1 2026-06-16 2026-06-16
www.pay.cookiescalifornia.com 1 2026-06-16 2026-06-16

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