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.

2 hosts · 304 ms

Download CSV
HostCertsFirst seenLast seen
namecorp.com 36 2026-04-26 2026-10-03
*.namecorp.com 36 2026-04-26 2026-10-03

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