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.

28 hosts · 302 ms

HostCertsFirst seenLast seen
truenas.com 8 2026-04-12 2026-08-19
*.truenas.com 4 2026-04-12 2026-08-19
update-tc.truenas.com 5 2026-04-22 2026-08-23
download.truenas.com 3 2026-05-15 2026-09-12
usage.truenas.com 4 2026-04-21 2026-08-19
update.truenas.com 3 2026-04-18 2026-08-16
tnconfig.truenas.com 3 2026-06-10 2026-08-10
api.truenas.com 11 2026-04-16 2026-10-02
feedback.ui.truenas.com 2 2026-04-23 2026-06-23
portal.truenas.com 4 2026-04-26 2026-10-02
channel.truenas.com 10 2026-04-13 2026-08-09
email.truenas.com 12 2026-04-12 2026-08-08
whks-tn.truenas.com 5 2026-05-24 2026-09-21
cqinshxgfbd0q6p.truenas.com 2 2026-05-10 2026-07-12
labs.truenas.com 4 2026-04-16 2026-08-23
docs.truenas.com 8 2026-04-13 2026-08-13
pages.truenas.com 20 2026-04-26 2026-08-23
apps.truenas.com 3 2026-05-26 2026-09-23
partners.truenas.com 13 2026-06-05 2026-10-02
connect.truenas.com 3 2026-04-30 2026-08-28
cdnt.truenas.com 5 2026-05-14 2026-09-11
support.truenas.com 18 2026-04-23 2026-08-19
truenas-update-dev.truenas.com 3 2026-05-29 2026-09-26
www.truenas.com 9 2026-04-15 2026-09-23
pay.truenas.com 1 2026-09-15 2026-09-15
try.truenas.com 16 2026-05-06 2026-09-01
security.truenas.com 10 2026-05-31 2026-09-29
support-proxy.truenas.com 3 2025-08-16 2026-09-17

Programmatic access: API GET /v1/hosts/truenas.com (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/truenas.com.