Subdomain Finder
Discover known subdomains using a configured commercial domain-intelligence provider.
How to interpret the result
Treat each lookup as a point-in-time observation. DNS can change, registration data can be redacted, CDNs can obscure origin infrastructure, and third-party intelligence providers can have coverage limits.
Historical data costs real provider credits
WHOISDR Pro uses configured intelligence providers for historical and reverse datasets that cannot be reconstructed from current public DNS alone.
View Pro plansAbout Subdomain Finder
Discover known subdomains using a configured commercial domain-intelligence provider. WHOISDR presents the returned data with context so you can decide which related lookup to run next. Results should be verified against the authoritative provider when you are making operational, legal or security-sensitive decisions.
Current-state checks
Free tools focus on live public data and diagnostic signals available at the time of the request.
Actionable follow-ups
Use related DNS, registration, network and web tools to verify a finding rather than relying on one signal in isolation.
Pro investigation workflow
Save evidence snapshots, export CSV, run bulk lookups and combine current data with historical intelligence.