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.

7 hosts · 211 ms

HostCertsFirst seenLast seenDNS
nordsecurity.com 17 2026-04-23 2026-10-06 ok
*.nordsecurity.com 12 2026-06-07 2026-10-06 —
unsupported.nordsecurity.com 14 2026-04-10 2026-10-05 ok
docs.nordsecurity.com 1 2026-05-07 2026-05-07 ok
sales.nordsecurity.com 5 2026-05-20 2026-10-01 ok
partners.nordsecurity.com 3 2026-07-10 2026-09-08 ok
www.nordsecurity.com 5 2026-04-28 2026-08-30 ok

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