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 · 345 ms

HostCertsFirst seenLast seen
cloud.emails.goaaa.com 2 2025-08-10 2026-07-29
image.emails.goaaa.com 2 2026-02-10 2026-02-12
click.emails.goaaa.com 2 2025-08-10 2026-07-28
view.emails.goaaa.com 2 2025-09-16 2026-09-03

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