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 · 260 ms

HostCertsFirst seenLast seenDNS
risingstaff.com 3 2026-04-11 2026-08-28 ok
time.risingstaff.com 1 2026-09-21 2026-09-21 ok
en.risingstaff.com 3 2026-06-06 2026-08-14 ok
es.risingstaff.com 3 2026-06-06 2026-08-15 ok
www.risingstaff.com 3 2026-04-11 2026-08-28 ok

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