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.

10 hosts · 213 ms

HostCertsFirst seenLast seen
health.amazon.com 4 2025-10-30 2026-09-08
us-gov-west-1.health-experience.health.amazon.com 3 2025-10-07 2026-09-30
dualstack.us-gov-west-1.health-experience.health.amazon.com 3 2025-10-07 2026-09-30
partner-alpha.pharmacy.api.health.amazon.com 2 2025-09-16 2026-08-17
partner-beta.pharmacy.api.health.amazon.com 2 2025-09-16 2026-08-17
cld.email.health.amazon.com 2 2026-03-29 2026-09-01
cloud.email.health.amazon.com 1 2026-01-25 2026-01-25
image.email.health.amazon.com 2 2026-01-22 2026-02-19
click.email.health.amazon.com 1 2026-01-25 2026-01-25
view.email.health.amazon.com 1 2026-01-25 2026-01-25

Programmatic access: API GET /v1/hosts/health.amazon.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/health.amazon.com.