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.

4 hosts · 205 ms

HostCertsFirst seenLast seen
cloud.email.unrefugees.org.au 1 2026-02-16 2026-02-16
image.email.unrefugees.org.au 5 2025-08-16 2026-09-03
click.email.unrefugees.org.au 1 2026-02-16 2026-02-16
view.email.unrefugees.org.au 1 2026-02-16 2026-02-16

Programmatic access: API GET /v1/hosts/email.unrefugees.org.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/email.unrefugees.org.au.