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.

2 hosts · 235 ms

HostCertsFirst seenLast seen
www2.e.tecnalia.com 15 2025-09-16 2026-09-24
www.www2.e.tecnalia.com 1 2025-09-16 2025-09-16

Programmatic access: API GET /v1/hosts/e.tecnalia.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/e.tecnalia.com.