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 · 260 ms

HostCertsFirst seenLast seenDNS
reviewflowz.com 28 2026-04-12 2026-10-01 ok
*.reviewflowz.com 10 2026-04-12 2026-09-29 —
url9112.reviewflowz.com 2 2026-09-22 2026-09-22 ok
staging.reviewflowz.com 6 2026-07-28 2026-09-25 ok
*.staging.reviewflowz.com 6 2026-07-28 2026-09-25 —
help.reviewflowz.com 10 2026-05-04 2026-08-30 ok
app.reviewflowz.com 5 2026-05-27 2026-09-25 ok
t.reviewflowz.com 8 2026-08-01 2026-09-29 ok
www.reviewflowz.com 20 2026-05-02 2026-10-01 ok
*.www.reviewflowz.com 8 2026-08-03 2026-10-01 —

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