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 · 223 ms

Download CSV
HostCertsFirst seenLast seen
open.em.truist.com 1 2025-07-22 2025-07-22
pages.em.truist.com 1 2025-10-10 2025-10-10
links.em.truist.com 1 2025-07-22 2025-07-22
content.em.truist.com 1 2025-07-22 2025-07-22

Programmatic access: API GET /v1/hosts/em.truist.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/em.truist.com.