Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts and first/last seen dates.

4 hosts · 199 ms

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HostCertsFirst seenLast seen
genuinetechnology.com 3 2026-06-19 2026-08-19
*.genuinetechnology.com 3 2026-06-19 2026-08-19
link.genuinetechnology.com 6 2026-06-03 2026-10-01
mta-sts.genuinetechnology.com 4 2026-05-11 2026-08-02

Programmatic access: API GET /v1/hosts/genuinetechnology.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/genuinetechnology.com.