Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts, first/last seen and live DNS status.

9 hosts · 246 ms

HostCertsFirst seenLast seenDNS
fastweb.com 28 2025-07-21 2026-09-23 ok
*.fastweb.com 30 2025-07-21 2026-09-23 —
*.staging.fastweb.com 17 2026-04-26 2026-09-23 —
admin.fastweb.com 1 2026-05-14 2026-05-14 ok
awards.fastweb.com 1 2026-05-14 2026-05-14 ok
*.updates.fastweb.com 1 2026-06-30 2026-06-30 —
clicks.updates.fastweb.com 3 2026-03-10 2026-06-30 ok
iris.fastweb.com 1 2026-05-14 2026-05-14 ok
skopos.fastweb.com 1 2026-05-14 2026-05-14 ok

Programmatic access, with DNS A records: API GET /v1/hosts/fastweb.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/fastweb.com.