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.

1 host · 208 ms

HostCertsFirst seenLast seen
hekishin-ec.com 2 2025-08-03 2026-07-03

Programmatic access: API GET /v1/hosts/hekishin-ec.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/hekishin-ec.com.