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.

16 hosts · 229 ms

HostCertsFirst seenLast seen
tpl.org 22 2026-02-04 2026-09-18
*.tpl.org 18 2026-02-04 2026-09-18
secure.tpl.org 1 2026-01-24 2026-01-24
fundraise.tpl.org 12 2026-05-17 2026-09-12
fpvalidate.tpl.org 3 2026-02-21 2026-10-05
donate.tpl.org 8 2026-05-01 2026-08-28
parkserve.tpl.org 9 2026-04-19 2026-09-16
m.tpl.org 1 2026-02-16 2026-02-16
events.tpl.org 2 2026-04-01 2026-09-01
*.events.tpl.org 2 2026-04-01 2026-09-01
park-bench-chat.tpl.org 5 2026-05-05 2026-09-04
act.tpl.org 12 2026-05-11 2026-09-06
support.tpl.org 6 2026-05-06 2026-09-01
test.tpl.org 5 2026-05-11 2026-09-08
www.tpl.org 4 2026-04-18 2026-08-16
survey.tpl.org 10 2026-04-24 2026-09-21

Programmatic access: API GET /v1/hosts/tpl.org (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/tpl.org.