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 · 222 ms

Download CSV
HostCertsFirst seenLast seen
emisgroupplc.com 2 2025-07-07 2026-06-07
*.emisgroupplc.com 2 2025-07-07 2026-06-07
ar20.emisgroupplc.com 2 2026-04-28 2026-04-28
legal.emisgroupplc.com 2 2025-08-04 2026-07-05
test.emisgroupplc.com 1 2025-10-25 2025-10-25
*.test.emisgroupplc.com 1 2025-10-25 2025-10-25

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