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 · 316 ms

HostCertsFirst seenLast seenDNS
netdirector.biz 14 2026-01-07 2026-09-11 ok
*.netdirector.biz 14 2026-01-07 2026-09-11 —
healthcare.netdirector.biz 2 2026-05-08 2026-06-03 ok
*.healthcare.netdirector.biz 2 2026-05-08 2026-06-03 —

Programmatic access, with DNS A records: API GET /v1/hosts/netdirector.biz (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/netdirector.biz.