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.

3 hosts · 230 ms

HostCertsFirst seenLast seenDNS
datovy-trezor.cz 4 2026-04-06 2026-09-21 ok
www.test.datovy-trezor.cz 1 2025-09-24 2025-09-24 nxdomain
www.datovy-trezor.cz 4 2026-04-06 2026-09-21 ok

Programmatic access, with DNS A records: API GET /v1/hosts/datovy-trezor.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/datovy-trezor.cz.