Find every subdomain
of a domain.

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

4 hosts · 301 ms

HostCertsFirst seenLast seenDNS
americanfasteners.com 10 2026-04-29 2026-09-17 ok
*.americanfasteners.com 8 2026-04-29 2026-09-17 —
link.americanfasteners.com 5 2026-05-08 2026-09-05 ok
www.americanfasteners.com 7 2026-05-28 2026-09-29 ok

Programmatic access, with DNS A records: API GET /v1/hosts/americanfasteners.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/americanfasteners.com.