VPN & Proxy Detection — Japan

Detect VPN, Proxy & Bot Traffic from Japan

Sentinel scores every visitor's network in real time — flagging VPN exit nodes, residential proxies, datacenter ASNs, and headless browsers originating from Japan. Free API. Under 40ms. No CAPTCHAs.

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< 40msResponse time globally

195+Countries covered

Free1,000 requests/hour — no card, no expiry

400+Device + network signals

The Japanese Threat Landscape

Why Japan traffic needs special scrutiny

Datacenter ASN concentration

Japan is NTT and SoftBank residential ranges are the most common origin for Asia-targeted SaaS fraud.

Residential proxy resale

Consumer ISP ranges in Japan 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 Japan. 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 Japanese-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.

How Sentinel Helps

What Sentinel detects for Japan traffic

Every major VPN provider's Japanese exit nodes (NordVPN, ExpressVPN, ProtonVPN, Mullvad, Surfshark, and 40+ more)
Commercial or peer-to-peer residential proxy pools using consumer Japanese IPs
Datacenter ASNs commonly used for automation (AWS, GCP, Azure, OVH, Hetzner, DigitalOcean, Vultr, Linode)
Tor exit nodes and known anonymous relays advertising Japanese geolocations
Headless browsers (Puppeteer, Playwright, Selenium) and antidetect tooling driving sessions from Japan
Country-spoofing — when a session claims to be in Japan but the network telemetry says otherwise

5-Minute Integration

One API call. Bearer token. Done.

        // Score any session — country-level signals included

        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 === 'JP' && network.vpn) blockOrChallenge();

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Stop Japanese VPN, proxy & bot fraud today

Free tier: 1,000 requests/hour. No card, no expiry. Detects VPN, residential proxy, datacenter, and bot traffic from Japan and 195 other countries.

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