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.

8 hosts · 264 ms

HostCertsFirst seenLast seenDNS
natbank.com 8 2026-02-18 2026-08-24 ok
cpfwnapicor-01.natbank.com 1 2025-11-13 2025-11-13 nxdomain
cpfwnapicor-02.natbank.com 1 2025-11-13 2025-11-13 nxdomain
rpv-hollywood.natbank.com 1 2025-11-13 2025-11-13 ok
cpfwnapicor.natbank.com 1 2025-11-13 2025-11-13 nxdomain
rpv-naples.natbank.com 1 2026-05-05 2026-05-05 ok
rpv.natbank.com 2 2025-11-13 2026-05-05 ok
www.natbank.com 8 2026-02-18 2026-08-24 ok

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