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.

15 hosts · 147 ms

HostCertsFirst seenLast seen
comsec.com.au 6 2025-08-28 2026-08-21
research.test01.comsec.com.au 2 2025-06-23 2026-07-13
www2.comsec.com.au 4 2025-10-22 2026-10-06
app3.comsec.com.au 1 2025-10-22 2025-10-22
app4.comsec.com.au 1 2025-10-22 2025-10-22
staging.comsec.com.au 2 2026-03-31 2026-10-05
www2.staging.comsec.com.au 6 2025-10-29 2026-09-29
app3.staging.comsec.com.au 3 2026-03-26 2026-06-12
app4.staging.comsec.com.au 3 2026-03-26 2026-06-12
research.staging.comsec.com.au 2 2025-06-23 2026-07-13
app.staging.comsec.com.au 5 2025-10-28 2026-09-29
www.staging.comsec.com.au 10 2025-10-29 2026-10-09
research.comsec.com.au 2 2025-06-23 2026-07-13
app.comsec.com.au 3 2025-10-22 2026-10-06
www.comsec.com.au 6 2025-08-28 2026-10-06

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