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.

10 hosts · 360 ms

HostCertsFirst seenLast seenDNS
slevomat.cz 26 2026-05-31 2026-10-06 ok
*.slevomat.cz 26 2026-05-31 2026-10-06 —
doporuc.slevomat.cz 4 2026-05-21 2026-09-29 ok
brand.slevomat.cz 4 2026-05-04 2026-05-20 ok
te.slevomat.cz 2 2026-06-06 2026-06-06 ok
api.slevomat.cz 4 2026-04-18 2026-09-15 ok
link.slevomat.cz 1 2025-12-17 2025-12-17 ok
kozel.slevomat.cz 5 2026-04-30 2026-10-06 ok
event.slevomat.cz 2 2026-05-27 2026-05-27 ok
verify.slevomat.cz 3 2026-04-20 2026-04-28 ok

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