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 · 292 ms

HostCertsFirst seenLast seen
ascoeq.com 20 2026-02-09 2026-10-01
*.ascoeq.com 8 2026-02-09 2026-09-12
link.ascoeq.com 1 2026-08-27 2026-08-27
helpdesk.ascoeq.com 6 2026-05-04 2026-08-30
aeq.ascoeq.com 5 2026-05-16 2026-09-12
www.ascoeq.com 5 2026-06-01 2026-10-01

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