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 · 238 ms

HostCertsFirst seenLast seen
cloud.emails.airparks.com 1 2025-11-05 2025-11-05
image.emails.airparks.com 5 2026-04-03 2026-10-05
click.emails.airparks.com 1 2025-11-06 2025-11-06
view.emails.airparks.com 1 2025-11-05 2025-11-05

Programmatic access: API GET /v1/hosts/emails.airparks.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/emails.airparks.com.