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 · 175 ms

HostCertsFirst seenLast seen
d.emails.saatva.com 10 2026-05-12 2026-09-07
e.emails.saatva.com 12 2026-05-13 2026-09-08
se.emails.saatva.com 20 2026-05-13 2026-09-08
mg.emails.saatva.com 5 2026-04-22 2026-08-20

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