Find every subdomain
of a domain.

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

10 hosts · 291 ms

HostCertsFirst seenLast seenDNS
redkite.org.au 24 2025-12-18 2026-10-05 ok
*.redkite.org.au 19 2025-12-18 2026-09-30 —
keepingconnected.redkite.org.au 3 2026-06-08 2026-08-15 ok
fundraise.redkite.org.au 1 2026-02-12 2026-02-12 ok
email.redkite.org.au 8 2026-06-02 2026-09-30 ok
learn.redkite.org.au 10 2026-04-28 2026-08-24 ok
sms.redkite.org.au 3 2026-05-07 2026-09-04 ok
mta-sts.redkite.org.au 3 2026-04-25 2026-09-14 ok
www.redkite.org.au 5 2026-05-22 2026-10-05 ok
my.redkite.org.au 4 2026-04-11 2026-08-21 ok

Programmatic access, with DNS A records: API GET /v1/hosts/redkite.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/redkite.org.au.