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.

6 hosts · 207 ms

HostCertsFirst seenLast seen
iungo.com 3 2026-05-14 2026-08-31
info.iungo.com 13 2026-04-23 2026-09-30
test.iungo.com 3 2026-05-01 2026-08-17
www.test.iungo.com 3 2026-05-01 2026-08-17
www.iungo.com 3 2026-05-14 2026-08-31
academy.iungo.com 10 2026-04-24 2026-09-30

Programmatic access: API GET /v1/hosts/iungo.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/iungo.com.