VPN Detector
Advanced VPN, Proxy & Tor Detection Service. Identify suspicious IP addresses with professional-grade analysis.
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Why Use VPN Detection?
Security & Fraud Prevention
Protect your website and services from malicious activities. VPN detection helps identify potential threats from anonymized connections often used in fraud, spam, and cyberattacks.
Accurate Analytics
Get reliable website analytics by filtering out VPN traffic. Understand your real user base without skewed data from proxy servers and VPN exit nodes.
Geo-Compliance
Ensure compliance with geographic restrictions and licensing agreements. Detect users bypassing regional content blocks through VPN services.
Gaming & Streaming
Maintain fair gaming environments and enforce streaming licenses. Identify players or viewers using VPNs to circumvent regional restrictions.
of internet users worldwide used a VPN in the past month, according to DataReportal's Global Digital 2025 report — roughly 1.6 billion people. Any system that relies solely on IP geolocation to identify users is now wrong about a third of the time.
Detection Methods
ISP Name Matching
Each IP’s ISP (from our DB-IP database) is matched against an enumerated list of around 30 commercial VPN providers — NordVPN, ExpressVPN, Surfshark, ProtonVPN, CyberGhost, and similar mainstream services. A direct ISP-name match scores 95 (Commercial VPN Provider).
Hosting Provider Detection
VPN providers don’t run servers from grandma’s house. We flag IPs whose ISP matches major hosting companies (AWS, Google Cloud, Azure, OVH, Hetzner, DigitalOcean, Linode, Vultr, M247, Datacamp, Quadranet, LeaseWeb, Choopa, Contabo) — commonly used as VPN exit nodes. Residential IPs from real consumer ISPs (Comcast, BT, Verizon) get the lowest VPN score by default.
Tor Exit Node Matching
We pull the complete Tor exit node list directly from check.torproject.org and refresh it hourly. If an IP appears in that list, it’s flagged as a Tor Exit Node with a score of 99 — no heuristics needed. We also flag IPs from ASNs known to host significant Tor infrastructure (FlokiNET, Quintex Alliance, Emerald Onion, and others).
Reverse DNS & Domain Patterns
The reverse-DNS hostname for each IP is checked against known VPN service domains (nordvpn.com, expressvpn.com, mullvad.net, and others) and suspicious keywords like vpn, proxy, tunnel, tor, anon, hide. A domain match adds significant points to the score.
Public Proxy List Cross-Check
We fetch a list of publicly known open proxies from ProxyScrape’s free feed (refreshed hourly) and flag any IP that appears in it. A direct match scores 90 (Known Proxy Server).
Score Aggregation
The above signals are combined into a single 0–100 score. The highest-confidence signal wins (e.g., a Tor exit always scores 99 regardless of other matches), and the result is shown with a confidence level (Very Low → Very High) and a list of every reason that contributed to the score.
Want to understand how VPN detection works more broadly?
Read our full breakdown: How to Detect VPN Usage: 7 Detection Methods with Accuracy Data — covers IP reputation, ASN analysis, port scanning, deep packet inspection, DNS leaks, WebRTC leaks, and behavioral analysis (most of these go beyond what any IP-based tool can do alone).
Understanding Your VPN Risk Score
Each IP receives a 0–100 score based on how many detection signals fire. The tool classifies an IP as a VPN once the score reaches 60 or above. Always check the Detection Factors list below the score to see which specific signals contributed.
Clean residential or business IP. No VPN, proxy, or datacenter signals matched. Safe to treat as a real user.
Some signals fired but below the VPN threshold. Often a CDN customer, suspected datacenter, or unknown ISP type.
Classified as a VPN or proxy. CDN/proxy services, suspected datacenters, or partial matches across multiple checks land here.
Confirmed commercial VPN provider, known proxy server, hosting-company IP, or Tor exit node. Block or challenge by default for high-risk transactions.
Accuracy & Limitations
Every VPN detection vendor claims “99% accuracy” on their marketing page. We’d rather tell you exactly what our tool can and can’t do.
What we catch reliably
- Mainstream commercial VPN providers: When NordVPN, ExpressVPN, Surfshark, ProtonVPN, IPVanish, Mullvad, and similar services run exit nodes whose ISP records carry their own brand name, we flag them as Commercial VPN Provider (score 95). Coverage depends on DB-IP’s ISP attribution, which is generally accurate for well-known providers.
- Tor exit nodes: We fetch the official list from check.torproject.org hourly. Any IP currently on that list is flagged as a Tor Exit Node (score 99).
- Major hosting / datacenter IPs: AWS, Google Cloud, Azure, OVH, Hetzner, DigitalOcean, Linode, Vultr, M247, Datacamp, Quadranet, LeaseWeb, Choopa, Contabo — flagged as Data Center / Cloud Provider (score 80).
- VPN service domains in reverse DNS: Hostnames like
nordvpn.com,protonvpn.com,mullvad.net, etc. trigger an additional score boost when present in the IP’s PTR record. - Public open proxies: Any IP appearing on the ProxyScrape free-proxy feed is flagged as Known Proxy Server (score 90).
Where detection breaks down
- Residential proxy services: Bright Data, Oxylabs, Smartproxy and similar services route through real consumer ISP IPs (sometimes from compromised mobile devices). These IPs will look residential to any IP-based tool, including ours, and will get a low score.
- Self-hosted VPNs: A WireGuard server running on a $5 VPS won’t be in any provider database. We can flag it as a datacenter IP, but not as a VPN specifically.
- Corporate VPNs: Traffic going to a company’s internal VPN endpoint is invisible from the outside — the request arrives at your site looking like a normal browser session from the corporate firewall’s public IP.
- VPN providers that hide behind generic upstream ISPs: When a VPN’s exit-node IPs are attributed to a generic hosting company rather than the VPN brand, our tool flags them as Data Center (score 80) but not as a specific commercial VPN.
- IPv6 coverage: Our Tor exit-list parser and public proxy list are IPv4-only. If a VPN provider offers IPv6, those addresses bypass the list-based checks (though ISP-name matching still applies).
- Newly-launched VPN brands: The list of commercial VPN provider names is maintained manually. A brand-new service won’t be flagged as a Commercial VPN Provider until the list is updated — though hosting-provider and reverse-DNS checks may still catch it.
For high-stakes use cases (payment fraud, account abuse), combine our IP-level detection with browser fingerprinting, device intelligence, and request-pattern analysis at the application layer. No IP-based tool catches every form of anonymization — layered defense is the right model.
VPN Providers & Services We Detect
Detection is driven by ISP-name matching and reverse-DNS checks. The lists below are the actual names and patterns our detector looks for.
The Tor exit list and public proxy list refresh hourly from upstream sources. The provider name and domain lists are maintained manually and expanded as new mainstream services launch.
Frequently Asked Questions
How do I check if an IP address is using a VPN?
Enter any IP address into the VPN Detector tool above. It analyzes the ISP, data center association, known VPN provider databases, and network behavior patterns to determine whether the IP belongs to a VPN, proxy, or Tor exit node. Results are instant and include a confidence score from 0 to 100.
Can you detect all VPN connections?
No VPN detection method is 100% accurate. Our tool matches IP addresses against an enumerated list of roughly 30 commercial VPN providers (NordVPN, ExpressVPN, Surfshark, ProtonVPN, and others) by ISP name and known VPN domain patterns. Tor exit nodes are caught reliably because the Tor Project publishes the complete list publicly. Residential proxy services that route through real consumer ISPs (Bright Data, Oxylabs, Smartproxy) are not reliably detectable by IP alone.
What is the difference between a VPN, proxy, and Tor?
A VPN encrypts all traffic from your device through a secure tunnel to a VPN server. A proxy only routes specific application traffic (usually web browsing) without encryption. Tor routes traffic through multiple volunteer-operated nodes with layered encryption, providing the highest anonymity but slowest speeds. Our tool detects all three types.
Is VPN detection free to use?
Yes, the VPN Detector tool is free for individual lookups with no signup required. Free users get 5 lookups per day. For bulk or automated VPN detection via API, an API key with credits is required. Visit the API documentation for integration details.
Why does the VPN detector show “Likely VPN” for my own IP?
Three common causes for residential false positives: (1) your ISP uses carrier-grade NAT with unusual ASN patterns; (2) your IP was previously used by a VPN provider and remains in older reputation databases; (3) your mobile carrier routes traffic through datacenter-adjacent infrastructure. If you’re not using a VPN, check the Detection Factors list to see exactly which signals fired.
Can the VPN detector identify which specific VPN service is being used?
When an IP belongs to a known commercial VPN provider, our tool surfaces the ISP or hosting company recorded for that IP (e.g., a brand-name match like “NordVPN” in the ISP field, or a hosting provider name like M247 or Datacamp). For tighter brand-level attribution you would need a paid commercial threat intelligence feed. For most use cases (fraud prevention, geo-compliance, abuse detection), the ISP-level signal is sufficient.
How often is your VPN provider database updated?
Tor exit node lists are re-fetched from check.torproject.org every hour, and public proxy lists from ProxyScrape are also refreshed hourly. The underlying ISP and geolocation data from DB-IP refreshes twice per month. The list of commercial VPN provider names is maintained manually and expanded when new mainstream services launch.
Does this detect residential proxy services like Bright Data or Oxylabs?
Generally no. Residential proxy services route traffic through real consumer ISPs (Comcast, Verizon, BT, etc.), which makes them undetectable by ISP-name and ASN-based methods. Our tool will classify those IPs as residential and assign them a low VPN score. For critical residential-proxy detection, combine IP-based tools with browser fingerprinting and request-pattern analysis at the application layer.
Can the VPN detector check multiple IPs at once?
The web tool processes one IP at a time. For bulk checks or automated detection in your application, use our JSON API which supports unlimited lookups with an API key. Integration examples are available for PHP, Python, JavaScript, and curl.
What does the VPN risk score actually mean?
The 0–100 score reflects how many detection signals matched. 0–39 is Minimal risk (typical residential or business IP). 40–59 is Low risk (some signals, possibly a CDN or hosting customer, but below the VPN threshold). 60–79 is Medium risk — the tool classifies the IP as a VPN at 60. 80–100 is High risk (commercial VPN provider, Tor exit node, or known proxy). Always check the Detection Factors list for the specific signals that contributed.