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.

6 hosts · 322 ms

HostCertsFirst seenLast seenDNS
ftitech.com 10 2025-09-05 2026-09-07 ok
*.ftitech.com 10 2025-09-05 2026-09-07 —
fortigate.ftitech.com 1 2026-09-23 2026-09-23 nodata
www.fortigate.ftitech.com 1 2026-09-23 2026-09-23 nxdomain
acmesh.ftitech.com 10 2026-02-06 2026-09-25 ok
www.acmesh.ftitech.com 2 2026-02-06 2026-02-06 nxdomain

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