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.

2 hosts · 164 ms

HostCertsFirst seenLast seen
fenwicksoftware.com.au 17 2026-02-18 2026-09-24
*.fenwicksoftware.com.au 17 2026-02-18 2026-09-24

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