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.

10 hosts · 238 ms

HostCertsFirst seenLast seenDNS
nexsan.com 5 2026-04-09 2026-08-07 ok
*.nexsan.com 2 2026-04-16 2026-10-01 —
support2.nexsan.com 5 2026-06-04 2026-10-02 ok
registration.nexsan.com 5 2026-04-09 2026-08-07 ok
learn.nexsan.com 5 2026-04-09 2026-08-07 ok
info.nexsan.com 12 2026-05-12 2026-09-07 ok
go.nexsan.com 10 2026-05-08 2026-09-03 ok
register.nexsan.com 5 2026-04-09 2026-08-07 ok
content.nexsan.com 16 2026-05-12 2026-09-08 ok
www.nexsan.com 5 2026-04-09 2026-08-07 ok

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