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.

5 hosts · 313 ms

HostCertsFirst seenLast seenDNS
risealliance.com 25 2026-05-08 2026-09-22 ok
*.risealliance.com 16 2026-05-27 2026-09-22 —
choose.risealliance.com 9 2026-04-17 2026-09-14 ok
tracking.risealliance.com 3 2026-06-19 2026-09-03 ok
www.risealliance.com 7 2026-05-08 2026-08-19 ok

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