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 · 244 ms

HostCertsFirst seenLast seenDNS
zoner.cz 3 2026-01-06 2026-05-22 ok
*.zoner.cz 1 2026-05-22 2026-05-22 —
napoveda.zoner.cz 5 2026-05-18 2026-09-14 ok
covid.zoner.cz 3 2026-03-03 2026-08-19 nxdomain
www.covid.zoner.cz 3 2026-03-03 2026-08-19 nxdomain
multilicence.zoner.cz 2 2026-01-06 2026-01-07 ok
ai.zoner.cz 2 2025-09-11 2026-09-11 ok
www.ai.zoner.cz 1 2026-09-11 2026-09-11 ok
wiki.zoner.cz 3 2025-10-01 2026-10-01 ok
www.wiki.zoner.cz 1 2026-10-01 2026-10-01 ok
manual.zoner.cz 3 2025-09-21 2026-09-21 ok
www.manual.zoner.cz 1 2026-09-21 2026-09-21 ok
air.zoner.cz 2 2025-07-08 2026-07-08 ok
www.air.zoner.cz 1 2026-07-08 2026-07-08 ok
chat.zoner.cz 3 2026-06-08 2026-08-07 ok
ucet.zoner.cz 2 2026-01-06 2026-01-07 ok
new.zoner.cz 2 2025-07-25 2026-07-25 ok
www.new.zoner.cz 1 2026-07-25 2026-07-25 ok
www.zoner.cz 2 2026-01-06 2026-01-07 ok

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