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.

7 hosts · 331 ms

HostCertsFirst seenLast seenDNS
leanfocus.com 23 2026-04-19 2026-10-02 ok
*.leanfocus.com 17 2026-04-19 2026-10-02 —
de.leanfocus.com 6 2026-06-02 2026-10-02 ok
webdisk.leanfocus.com 6 2026-06-02 2026-10-02 ok
cpanel.leanfocus.com 6 2026-06-02 2026-10-02 ok
mail.leanfocus.com 6 2026-06-02 2026-10-02 ok
www.leanfocus.com 6 2026-06-02 2026-10-02 ok

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