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 · 258 ms

Download CSV
HostCertsFirst seenLast seen
lab.jti.com 1 2026-02-03 2026-02-03
sts02.lab.jti.com 3 2026-03-27 2026-10-05
edge.lab.jti.com 1 2026-02-03 2026-02-03
mail.lab.jti.com 1 2026-05-22 2026-05-22
autodiscover.lab.jti.com 1 2026-05-22 2026-05-22
gvamrsproxy.lab.jti.com 1 2026-05-22 2026-05-22

Programmatic access: API GET /v1/hosts/lab.jti.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/lab.jti.com.