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.

12 hosts · 405 ms

HostCertsFirst seenLast seenDNS
rangeusa.com 3 2026-01-20 2026-09-14 ok
*.rangeusa.com 4 2026-01-20 2026-09-14 —
acumatica.rangeusa.com 1 2026-05-20 2026-05-20 ok
www.acumatica.rangeusa.com 1 2026-05-20 2026-05-20 ok
d.cd.rangeusa.com 16 2026-04-07 2026-10-01 ok
e.cd.rangeusa.com 14 2026-04-08 2026-10-02 ok
se.cd.rangeusa.com 14 2026-04-08 2026-10-02 ok
mg.cd.rangeusa.com 4 2026-04-17 2026-08-15 ok
forms.cd.rangeusa.com 7 2026-06-01 2026-09-27 ok
link.rangeusa.com 18 2026-04-25 2026-08-21 ok
s.rangeusa.com 20 2026-04-27 2026-08-24 ok
mg.members.rangeusa.com 5 2026-05-01 2026-08-29 ok

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