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 · 287 ms

HostCertsFirst seenLast seenDNS
honorvet.com 2 2026-01-26 2026-06-23 ok
smart.honorvet.com 4 2026-04-11 2026-08-09 ok
www.honorvet.com 2 2026-01-31 2026-06-28 ok

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