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.

3 hosts · 265 ms

HostCertsFirst seenLast seen
engie.pt 3 2025-06-19 2026-07-17
hydroview.engie.pt 2 2026-04-26 2026-09-26
www.engie.pt 3 2025-06-19 2026-07-17

Programmatic access: API GET /v1/hosts/engie.pt (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/engie.pt.