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 · 231 ms

HostCertsFirst seenLast seen
productdna.com 51 2026-04-29 2026-10-04
*.productdna.com 43 2026-05-26 2026-10-04
eiffage.productdna.com 2 2026-05-26 2026-05-26
trail.productdna.com 5 2026-06-09 2026-10-06
status.productdna.com 4 2026-06-10 2026-10-07
www.productdna.com 8 2026-04-29 2026-08-25

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