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 · 274 ms

HostCertsFirst seenLast seen
truspireusa.com 10 2026-01-30 2026-08-30
*.truspireusa.com 5 2026-06-30 2026-08-30
pat.truspireusa.com 2 2026-01-30 2026-06-12
www.truspireusa.com 3 2026-01-30 2026-08-24

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