VPN & Proxy Detection — United StatesDetect VPN, Proxy & Bot Traffic from United States
Sentinel scores every visitor's network in real time — flagging VPN exit nodes, residential proxies, datacenter ASNs, and headless browsers originating from the United States. Free API. Under 40ms. No CAPTCHAs.
Why United States traffic needs special scrutiny
Datacenter ASN concentration
United States is high concentration of datacenter ASNs (AWS, Google Cloud, DigitalOcean) routinely used for credential stuffing and trial abuse.
Residential proxy resale
Consumer ISP ranges in United States are routinely sold through residential proxy networks like ShadowNode and Bright Data. These IPs look real but rotate every few minutes — a clear bot signature once you know what to look for.
VPN exit-node clustering
The same handful of hosting providers dominate VPN exit nodes in United States. Sentinel maintains live mappings of these ranges so a new IP from a known VPN ASN is flagged within seconds of going live.
Antidetect browser usage
Multi-accounting fraud against US-targeted SaaS, fintech, and e-commerce increasingly uses Kameleo, GoLogin, or AdsPower to spoof device fingerprints. Sentinel scores these at the device layer, not the IP layer.
What Sentinel detects for United States traffic
- Every major VPN provider's US exit nodes (NordVPN, ExpressVPN, ProtonVPN, Mullvad, Surfshark, and 40+ more)
- Residential proxy networks reselling consumer US IPs (ShadowNode, Bright Data, Smartproxy, Oxylabs)
- Datacenter ASNs commonly used for automation (AWS, GCP, Azure, OVH, Hetzner, DigitalOcean, Vultr, Linode)
- Tor exit nodes and known anonymous relays advertising US geolocations
- Headless browsers (Puppeteer, Playwright, Selenium) and antidetect tooling driving sessions from United States
- Country-spoofing — when a session claims to be in United States but the network telemetry says otherwise
One API call. Bearer token. Done.
const r = await fetch('https://sntlhq.com/v1/evaluate', {
method: 'POST',
headers: { 'Authorization': 'Bearer sk_live_...' },
body: JSON.stringify({ token: sentinelToken })
});
const { decision, country, network } = await r.json();
if (country === 'US' && network.vpn) blockOrChallenge();
Stop US VPN, proxy & bot fraud today
Free tier. 1,000 API requests per hour. No credit card. Detects VPN, residential proxy, datacenter, and bot traffic from United States and 195 other countries.