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
threebestrated.com.au 25 2025-07-31 2026-09-18 ok
*.threebestrated.com.au 19 2026-04-23 2026-09-18 —
mail.threebestrated.com.au 7 2026-05-10 2026-09-10 ok
www.threebestrated.com.au 6 2025-07-31 2026-08-06 ok

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