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 · 279 ms

HostCertsFirst seenLast seenDNS
hsuginseng.com 4 2026-02-19 2026-07-17 ok
*.hsuginseng.com 1 2026-04-23 2026-04-23 —
erp.hsuginseng.com 8 2026-05-19 2026-09-16 ok
www.hsuginseng.com 17 2026-02-19 2026-08-15 ok

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