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.

23 hosts · 348 ms

HostCertsFirst seenLast seenDNS
initmax.cz 24 2026-04-30 2026-10-06 ok
*.initmax.cz 12 2026-05-06 2026-09-01 —
student-postgresql-01.initmax.cz 5 2026-05-02 2026-08-30 ok
jira.initmax.cz 9 2026-04-23 2026-09-09 ok
translate.initmax.cz 6 2026-04-24 2026-07-23 ok
servicedesk.initmax.cz 7 2026-04-24 2026-09-22 ok
portal.initmax.cz 1 2026-08-30 2026-08-30 ok
exam.initmax.cz 7 2026-04-25 2026-09-22 ok
crm.initmax.cz 5 2026-05-14 2026-09-13 ok
exams-admin.initmax.cz 6 2026-04-13 2026-09-11 ok
vimeo.initmax.cz 5 2026-05-06 2026-09-03 ok
repo.initmax.cz 5 2026-05-05 2026-09-02 ok
test-unifer.initmax.cz 5 2026-05-08 2026-09-06 ok
docker.initmax.cz 9 2026-04-23 2026-09-09 ok
partners.initmax.cz 1 2026-08-30 2026-08-30 ok
git.initmax.cz 7 2026-04-24 2026-09-22 ok
vault.initmax.cz 7 2026-04-29 2026-09-27 ok
gpt.initmax.cz 11 2026-04-23 2026-08-14 ok
mixpost.initmax.cz 9 2026-04-23 2026-09-09 ok
workflow.initmax.cz 9 2026-04-23 2026-09-09 ok
www.initmax.cz 12 2026-04-30 2026-10-06 ok
caremax.initmax.cz 1 2026-08-27 2026-08-27 ok
pbx.initmax.cz 12 2026-04-25 2026-09-23 ok

Programmatic access, with DNS A records: API GET /v1/hosts/initmax.cz (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/initmax.cz.