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 · 291 ms

HostCertsFirst seenLast seen
cloud.marketing.galleri.com 2 2025-08-10 2026-07-28
image.marketing.galleri.com 3 2026-01-27 2026-02-12
click.marketing.galleri.com 2 2025-08-10 2026-07-29
view.marketing.galleri.com 2 2025-08-10 2026-07-28

Programmatic access: API GET /v1/hosts/marketing.galleri.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/marketing.galleri.com.