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.

14 hosts · 280 ms

HostCertsFirst seenLast seenDNS
foundersfund.com 4 2025-10-26 2026-08-13 ok
*.foundersfund.com 1 2025-10-26 2025-10-26 —
am.foundersfund.com 1 2026-09-03 2026-09-03 ok
www.am.foundersfund.com 1 2026-09-03 2026-09-03 ok
symposium.foundersfund.com 5 2026-05-21 2026-09-09 ok
www.symposium.foundersfund.com 5 2026-05-21 2026-09-09 ok
shop.foundersfund.com 5 2026-06-02 2026-09-15 ok
www.shop.foundersfund.com 4 2026-06-02 2026-07-27 ok
mta-sts.foundersfund.com 2 2026-06-02 2026-08-13 ok
summit.foundersfund.com 5 2026-05-20 2026-09-08 ok
www.summit.foundersfund.com 5 2026-05-20 2026-09-08 ok
campout.foundersfund.com 6 2026-05-26 2026-09-09 ok
www.campout.foundersfund.com 5 2026-05-15 2026-09-07 ok
www.foundersfund.com 3 2026-06-06 2026-08-13 ok

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