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.

4 hosts · 252 ms

HostCertsFirst seenLast seen
*.nikolavalenti.com 2 2026-04-24 2026-04-24
*.web01.nikolavalenti.com 2 2026-04-24 2026-04-24
*.apps01.nikolavalenti.com 2 2026-04-24 2026-04-24
www.nikolavalenti.com 2 2026-03-08 2026-07-29

Programmatic access: API GET /v1/hosts/nikolavalenti.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/nikolavalenti.com.