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.

4 hosts · 293 ms

HostCertsFirst seenLast seenDNS
grandappliance.com 4 2026-04-12 2026-08-12 ok
ai.grandappliance.com 2 2026-02-02 2026-06-19 ok
kiosq.grandappliance.com 5 2026-05-06 2026-09-03 ok
www.grandappliance.com 4 2026-04-12 2026-08-12 ok

Programmatic access, with DNS A records: API GET /v1/hosts/grandappliance.com (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/grandappliance.com.