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.

4 hosts · 198 ms

HostCertsFirst seenLast seenDNS
cloud.notifications.auspost.com.au 1 2026-01-18 2026-01-18 servfail
image.notifications.auspost.com.au 2 2025-12-31 2026-01-06 ok
click.notifications.auspost.com.au 1 2026-01-27 2026-01-27 ok
view.notifications.auspost.com.au 1 2026-01-28 2026-01-28 ok

Programmatic access, with DNS A records: API GET /v1/hosts/notifications.auspost.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/notifications.auspost.com.au.