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.

3 hosts · 266 ms

HostCertsFirst seenLast seenDNS
dempseycc.com.au 18 2026-04-28 2026-09-04 ok
*.dempseycc.com.au 18 2026-04-28 2026-09-04 —
mta-sts.dempseycc.com.au 4 2026-04-27 2026-09-16 ok

Programmatic access, with DNS A records: API GET /v1/hosts/dempseycc.com.au (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/dempseycc.com.au.