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 · 225 ms

HostCertsFirst seenLast seenDNS
guavahealth.com 30 2026-05-13 2026-09-09 ok
*.guavahealth.com 34 2026-05-13 2026-10-03 —
checkout.guavahealth.com 8 2026-04-20 2026-08-16 ok

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