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 · 305 ms

HostCertsFirst seenLast seen
emdnet.com 6 2026-01-21 2026-10-07
*.emdnet.com 1 2026-01-21 2026-01-21
cipp.emdnet.com 2 2026-02-19 2026-07-10
backups.emdnet.com 5 2026-05-02 2026-09-25
365backups.emdnet.com 3 2026-06-06 2026-08-08
www.emdnet.com 5 2026-04-24 2026-10-07

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