VPN & Proxy Detection — United StatesDetect VPN, Proxy & Bot Traffic from United States
Maskbreak 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 server-side. No CAPTCHAs.
The networks United States traffic actually arrives from
United States has 18,559 autonomous systems on the public registry. 1,827 of them are hosting, cloud or transit networks holding 1288.3M addresses between them — the ranges a commercial VPN or datacenter proxy exits from. Residential broadband is the rest, and that is the traffic worth watching, because a residential proxy hides inside it.
| ASN | Network | IPv4 space |
|---|---|---|
| AS749 | DNIC-AS-00749 | 222.6M addresses |
| AS16509 | AMAZON-02 | 152.8M addresses |
| AS7018 | ATT-INTERNET4 | 89.2M addresses |
| AS8075 | MICROSOFT-CORP-MSN-AS-BLOCK | 80.7M addresses |
| AS7922 | COMCAST-7922 | 42.1M addresses |
| AS701 | UUNET | 40.6M addresses |
| AS721 | DNIC-ASBLK-00721-00726 | 29.6M addresses |
| AS3356 | LEVEL3 | 27.4M addresses |
Largest hosting-shaped networks registered in United States, by IPv4 allocation. Registry data, refreshed daily. A datacenter ASN is not evidence of fraud on its own — it is one signal, weighed alongside device and behaviour.
Why United States traffic needs special scrutiny
Datacenter ASN concentration
A high concentration of datacenter ASNs (AWS, Google Cloud, DigitalOcean) is routinely used for credential stuffing and trial abuse.
Residential proxy resale
Consumer ISP ranges in United States can appear in commercial or peer-to-peer residential proxy pools. A consumer ISP label is not proof of fraud; combine it with device, session, and routing signals.
VPN exit-node clustering
The same handful of hosting providers dominate VPN exit nodes in United States. Maskbreak 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. Maskbreak scores these at the device layer, not the IP layer.
What Maskbreak detects for United States traffic
- Every major VPN provider's US exit nodes (NordVPN, ExpressVPN, ProtonVPN, Mullvad, Surfshark, and 40+ more)
- Commercial or peer-to-peer residential proxy pools using consumer US IPs
- 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
VPN use & data rules in the United States
The US has no single federal privacy law; you navigate a state patchwork — California's CCPA/CPRA, plus Virginia, Colorado, Texas and others — and effectively all of them carve out security and fraud-prevention processing from consumer opt-out rights. Card-not-present fraud and refund abuse dominate the US landscape, and the country hosts both the world's largest datacenter footprint (AWS, GCP, Azure ranges constantly recycled for automation) and one of its largest residential-proxy customer bases. US traffic therefore needs the full signal stack: a clean IP means little when the device layer shows antidetect or automation tooling.
One API call. Bearer token. Done.
// Server-side only: an sk_live_ key must never reach the browser.
const r = await fetch('https://maskbreak.com/v1/evaluate', {
method: 'POST',
headers: {
'Authorization': 'Bearer sk_live_...',
'Content-Type': 'application/json'
},
body: JSON.stringify({ token: req.body.monocle })
});
const { decision, country, network } = await r.json();
if (country === 'US' && network.vpn) blockOrChallenge();
Stop US VPN, proxy & bot fraud today
Free tier: 1,000 requests/hour. No card, no expiry. Detects VPN, residential proxy, datacenter, and bot traffic from United States and 195 other countries.