Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts and first/last seen dates.

3 hosts · 199 ms

HostCertsFirst seenLast seen
colesfusion.com.au 2 2025-08-13 2026-09-07
systest.colesfusion.com.au 3 2026-04-01 2026-09-07
www.colesfusion.com.au 2 2025-08-13 2026-09-07

Programmatic access: API GET /v1/hosts/colesfusion.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/colesfusion.com.au.