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 · 268 ms

HostCertsFirst seenLast seen
*.id.fc2.com 1 2026-09-24 2026-09-24
static.id.fc2.com 2 2025-08-13 2026-07-12
secure.id.fc2.com 3 2025-07-17 2026-07-23
api2.secure.id.fc2.com 1 2025-12-10 2025-12-10
api.secure.id.fc2.com 1 2025-10-27 2025-10-27
admin.secure.id.fc2.com 5 2025-12-01 2026-10-05

Programmatic access: API GET /v1/hosts/id.fc2.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/id.fc2.com.