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 · 368 ms

HostCertsFirst seenLast seenDNS
fraudblocker.com 18 2026-05-09 2026-09-29 ok
*.fraudblocker.com 18 2026-05-09 2026-09-29 —
backend.fraudblocker.com 6 2026-04-18 2026-08-14 ok
whitelabel.fraudblocker.com 7 2026-05-20 2026-09-15 ok
app.fraudblocker.com 8 2026-04-29 2026-08-25 ok
monitor.fraudblocker.com 3 2026-04-27 2026-08-15 ok
docs.fraudblocker.com 7 2026-04-22 2026-09-19 ok
referrals.fraudblocker.com 5 2026-05-28 2026-09-25 ok
status.fraudblocker.com 4 2026-06-04 2026-10-03 ok
protect.fraudblocker.com 8 2026-04-23 2026-08-19 ok
pay.fraudblocker.com 10 2026-04-24 2026-08-20 ok
gateway.fraudblocker.com 11 2026-06-02 2026-09-28 ok

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