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 · 267 ms

Download CSV
HostCertsFirst seenLast seen
app.response.tafensw.edu.au 2 2025-08-18 2026-08-26
images.response.tafensw.edu.au 3 2025-10-03 2026-10-15

Programmatic access: API GET /v1/hosts/response.tafensw.edu.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/response.tafensw.edu.au.