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 · 309 ms

HostCertsFirst seenLast seenDNS
energex.com.au 16 2026-04-28 2026-08-24 ok
swp.energex.com.au 2 2026-02-09 2026-02-09 ok
apps.energex.com.au 2 2026-04-13 2026-04-13 ok
www.energex.com.au 14 2026-04-28 2026-08-24 ok

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