Run a live fraud check on your current connection — VPNs, proxies, Tor exit nodes, datacenter hosting, and residential proxy networks. Or look up any IP address, one at a time or twenty at once.
Paste any public IPv4 or IPv6 address for a live verdict — VPN, proxy, Tor, datacenter, and anonymity signals. Switch to bulk to check up to 20 at once.
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Bulk checks are free — we ask for a work email and add you to the monthly Fraud Brief (unsubscribe anytime).
IP
Verdict
Risk
Signals
Network
How It Works
Detection in under 40ms
01
Real-time detection
Your IP is checked against 400+ signals in under 40ms — VPN databases, ASN reputation, datacenter ranges, residential proxy networks, and Tor exit node lists.
02
No personal data stored
We check network characteristics, not personal information. No browsing history, no cookies, no personally identifiable data is collected or retained.
03
Powered by Sentinel API
This tool runs on the same detection engine available for your application. Integrate the same intelligence into your signup flow, checkout, or login with a single API call.
FAQ
Common questions
What does this tool check?
This tool checks your IP address against VPN and proxy databases, ASN reputation data, datacenter IP ranges, residential proxy network signatures, and Tor exit node lists. It also evaluates browser and device signals for additional fraud indicators.
Is it free?
Yes, completely free. No account needed, no credit card required. For bulk or programmatic access to the same data, sign up for an API key at /signup — the free tier includes 1,000 requests per hour.
How accurate is it?
Sentinel checks 400+ signals per request with under 40ms latency. Accuracy exceeds 99% for datacenter and VPN IPs, and exceeds 95% for residential proxies — which are the hardest category to detect reliably.
Can I use this for my application?
Yes. Sign up for a free API key at /signup. The free tier includes 1,000 requests per hour. The API returns the same signals shown here — risk score, VPN/proxy/Tor/datacenter/residential proxy flags — plus additional enrichment data including ASN, ISP, and device signals.
Can I look up a specific IP address?
Yes — use the Check Any IP box above for a live verdict on any public IPv4 or IPv6 address, or the bulk tab for up to 20 at once (free, work email required). For programmatic volume, the API's GET /v1/lookup/{ip} endpoint returns the same verdict with your API key — sign up at /signup.
Add this to your platform
10,000 free API requests per month. No credit card. Live in minutes.