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 · 356 ms

HostCertsFirst seenLast seenDNS
hoteltruebsee.ch 5 2026-04-16 2026-08-15 ok
yawave.hoteltruebsee.ch 6 2026-05-03 2026-09-01 ok
www.hoteltruebsee.ch 6 2026-04-22 2026-08-22 ok

Programmatic access, with DNS A records: API GET /v1/hosts/hoteltruebsee.ch (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/hoteltruebsee.ch.