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.

4 hosts · 320 ms

HostCertsFirst seenLast seenDNS
triphase-tech.com 5 2026-05-09 2026-09-08 ok
remote.triphase-tech.com 1 2025-11-21 2025-11-21 ok
www.remote.triphase-tech.com 1 2025-11-21 2025-11-21 nxdomain
www.triphase-tech.com 5 2026-05-09 2026-09-08 ok

Programmatic access, with DNS A records: API GET /v1/hosts/triphase-tech.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/triphase-tech.com.