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.

6 hosts · 295 ms

HostCertsFirst seenLast seen
kenneths.com 5 2025-09-12 2026-09-14
*.kenneths.com 2 2026-05-03 2026-06-14
mail.kenneths.com 3 2025-09-12 2026-09-14
email.kenneths.com 3 2025-09-12 2026-09-14
autodiscover.kenneths.com 3 2025-09-12 2026-09-14
www.kenneths.com 3 2025-09-12 2026-09-14

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