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 · 252 ms

HostCertsFirst seenLast seenDNS
postshop.cz 1 2026-04-16 2026-04-16 ok
test.postshop.cz 2 2025-06-12 2026-07-08 nxdomain
www.postshop.cz 1 2026-04-16 2026-04-16 ok

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