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.

8 hosts · 185 ms

HostCertsFirst seenLast seen
certauto.kr 3 2025-07-15 2025-11-10
*.certauto.kr 2 2025-07-15 2025-07-15
poc.certauto.kr 3 2025-12-18 2025-12-22
apache.certauto.kr 1 2026-01-23 2026-01-23
iis.certauto.kr 1 2026-01-23 2026-01-23
tomcat.certauto.kr 1 2026-01-23 2026-01-23
www.certauto.kr 1 2025-11-10 2025-11-10
nginx.certauto.kr 1 2026-01-23 2026-01-23

Programmatic access: API GET /v1/hosts/certauto.kr (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/certauto.kr.