DomainRadar
Domain intelligence, availability, WHOIS, and brand monitoring – at scale.
DomainRadar checks domain availability, parses WHOIS / RDAP, and watches the internet for brand impersonation. One API and one dashboard for the four jobs every domain team handles: is this name free?, who owns this domain?, what's available across these 10,000 candidates?, and is anyone registering lookalikes of our brand?
What you can do with DomainRadar
Check a single domain
Availability, registrar, expiry, or full WHOIS – pick the depth of answer you need.
Bulk-check thousands at once
Stream results as they resolve. Up to a million domains per job.
Generate brandable name candidates
Describe your product; AI proposes names; DomainRadar checks them all.
Monitor your brand 24/7
Watch Certificate Transparency logs for typosquats and lookalike domains.
Core concepts in one minute
- Check modes – four levels of depth: probabilistic (Bloom), DNS-verified, basic info, full WHOIS. Each costs differently and tells you a different amount.
- Bulk check – one job that fans out to thousands of domains, with results streamable as they complete.
- Name generator – an AI prompt → tens of thousands of candidate names → bulk-check pipeline.
- Saved domains – your starred list, with the latest check result and optional notes per domain.
- Brand Monitor – keyword-based watchers over Certificate Transparency logs. Alerts you when someone registers a lookalike with a fresh TLS cert.
How DomainRadar answers fast
Every check flows through a pipeline that stops at the first definitive answer:
cache → Bloom filter → DNS lookup → RDAP → WHOISMost "is this domain free?" questions resolve in the cache or the Bloom filter – nanoseconds, zero network. The rest cascade to authoritative sources only when needed. You're billed for the method that actually answered, not every step along the way.
See Check modes for what each step costs and when it's used.
Pricing
DomainRadar bills per-query, broken down by the method that answered. Bloom and DNS are cheap; RDAP and full WHOIS are pricier. Free-tier allowances cover most small teams' month. See pricing for current rates.