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 · 243 ms

HostCertsFirst seenLast seenDNS
nbfinancial.com 2 2026-05-15 2026-08-24 ok
pprod.nbfinancial.com 1 2025-07-07 2025-07-07 nxdomain
info.nbfinancial.com 3 2026-05-08 2026-08-24 ok
www.nbfinancial.com 2 2026-05-15 2026-08-24 ok

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