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 · 283 ms

HostCertsFirst seenLast seen
comenregions.com 3 2026-05-23 2026-08-04
crm.comenregions.com 6 2026-05-22 2026-09-20
docusign.comenregions.com 5 2026-05-17 2026-09-14
www.comenregions.com 3 2026-05-23 2026-08-04

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