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.

19 hosts · 299 ms

HostCertsFirst seenLast seenDNS
penguinrandomhouse.com.au 2 2025-10-03 2026-01-05 ok
vicvpnmfa.penguinrandomhouse.com.au 1 2025-12-18 2025-12-18 ok
nswvpnmfa.penguinrandomhouse.com.au 1 2025-12-18 2025-12-18 ok
bolive.penguinrandomhouse.com.au 1 2026-03-25 2026-03-25 nxdomain
portal.penguinrandomhouse.com.au 1 2026-06-05 2026-06-05 ok
mymail.penguinrandomhouse.com.au 2 2025-09-22 2026-09-18 ok
autodiscover.penguinrandomhouse.com.au 2 2025-09-22 2026-09-18 ok
files.penguinrandomhouse.com.au 1 2025-12-09 2025-12-09 ok
businessobjects.penguinrandomhouse.com.au 3 2025-08-25 2026-08-17 nxdomain
portaluat.penguinrandomhouse.com.au 1 2026-05-07 2026-05-07 ok
bouat.penguinrandomhouse.com.au 1 2026-03-25 2026-03-25 nxdomain
businessobjectsuat.penguinrandomhouse.com.au 3 2025-08-25 2026-08-17 nxdomain
vault.penguinrandomhouse.com.au 2 2025-10-17 2026-10-06 nxdomain
botest.penguinrandomhouse.com.au 1 2026-03-25 2026-03-25 nxdomain
businessobjectstest.penguinrandomhouse.com.au 3 2025-08-25 2026-08-17 nxdomain
portaldev.penguinrandomhouse.com.au 1 2026-05-07 2026-05-07 ok
bodev.penguinrandomhouse.com.au 1 2026-03-25 2026-03-25 nxdomain
businessobjectsdev.penguinrandomhouse.com.au 3 2025-08-25 2026-08-17 nxdomain
www.penguinrandomhouse.com.au 2 2025-10-03 2026-06-10 ok

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