The Most Intelligent
Proxy Detection API Service

Block Proxies & VPNs with the Most Accurate Proxy Detection Tools

Score IP Addresses With Confidence & Without False-Positives

Proxy Connections Enable Abusive Users & Bad Actors

Online fraudsters hide their IP addresses through proxies, Tor nodes, & VPN connections to conceal their location and true identity. IPQS free Proxy Detection service can prevent fraudsters with anonymized or spoofed IP addresses from accessing critical pages of your site, creating headaches such as credit card fraud & chargebacks, fraudulent accounts, advertising click fraud, geo location bypassing, or scraping sensitive content. Users that register or login with anonymized connections, such as with a proxy IP address or VPN, are likely to create duplicate or fake accounts, use stolen credit cards, or perform similar types of high risk behavior.

IPQS Proxy Detection API is the most comprehensive tool online to identify IP address connections with a high probability of malicious intent. Assign IP reputation scores to any click, payment, or user. This includes proxy IP addresses that are open proxies, anonymous proxies, Tor nodes, VPN providers, hosting providers, data centers, spammers, malware & spyware, botnets, residential proxies, and other undesirable shared connections that are highly inclined to engage in malicious activity.

Tap into the most advanced data set for Proxy Detection & IP Address Reputation Scoring. Unrivaled detection rates for residential proxies, compromised devices, anonymous proxies, datacenter proxies, and malicious proxy IP addresses used by the worst cybercriminals & abusers online.

How Does IPQS Proxy Detection Service Work?

Proxy Detection At Its Best

IPQS Proxy Detection service can be queried via an API lookup, through our user dashboard, or by uploading a CSV file. Instantly reduce fraud by tapping into our real-time threat detection. For each lookup, an IP address and other forensic factors of the connection are analyzed to determine if the user is hiding behind a spoofed or anonymized IP, tunneled connection, botnet, or attempting to frequently change their device.

IP reputation scoring is automatically expanded to include VPN detection, residential proxy detection, and all other types of anonymous IP detection. Accurately view risk analysis for all high risk tunnels.

Over 25 data points are returned for each Proxy Detection API lookup to provide a detailed risk assessment of the click, user, or transaction. IPQS threat blacklists are actively maintained and updated in real-time to include the latest emerging threats from hijacked computers, open proxies, residential proxies, botnets, data centers, private VPNs, & other sources of high risk connections.

Older data and retired proxy IP addresses that are no longer threats are frequently purged from our blacklists to reduce the chance of false-positives. We understand how crucial it is to never impact your legitimate traffic and this is one of the many ways IPQS excels against other proxy detection service providers.

Use Cases
  • Duplicate & Fake Users - Identify fraudulent and high risk users including fake accounts and duplicate users. Automate user quality with less manual reviews.
  • Click Fraud & Ad Fraud - Detect fake clicks from bots and high risk proxies & VPNs in real-time before they can impact your advertisers or eat up precious ad budgets.
  • Payment & Transaction Fraud - Prevent chargebacks before they can negatively impact your business. Detect anonymous proxies and identify high risk transactions without losing money to fraudsters.
  • Account Takeover - Keep your users safe and prevent cybercriminals from hijacking accounts on your platform with advanced residential proxies.
  • Geo Enforcement - Only allow users from certain geographic regions, such as for OTT/VOD streaming services, gaming and casino services, or access to products only available in specific regions. Accurate geo blocking prevents users from bypassing restrictions.
  • Bots, Proxies, VPN, & TOR Connections - Easily identify high risk connections likely to engage in fraud with the greatest accuracy in the industry.
  • Lead Generation & User Data Verification - Ensure data that you are collecting or purchasing is valid and accurate. In addition to the IP address, other data such as phone numbers, email addresses, physical addresses, and other user info can be scored for accuracy and assigned a risk profile.

IPQS Proxy VPN Detection Activity


High Risk Proxies & VPNs


New Blacklisted IPs Per Second


Malicious Data Center IP Addresses

IPQS is the Internet's leading source for IP Reputation scoring and data. Identify abusive IP addresses with over 40% greater detection rates and less false-positives than similar services.

Unrivalled IP Intelligence Built For Your Audience

Most Accurate Protection, Optimized For All Countries

IPQS Proxy Detection is powered with the experience of over 10 years of anti-fraud technology. As new patterns of fraud emerge, IPQS is quick to adapt, to ensure our edge on fraudsters and cybercriminals is never diminished.

We Only Use the Freshest Data

Our secret to avoiding false-positives is using fresh data that was recently collected within the past few hours or days. This provides the best experience for your users, so legitimate IP addresses are never penalized. Detect anonymous proxies with confidence.

Less Costs With Greater Accuracy

Access the most accurate proxy detection service without feeling like you are paying for it. Our prices are 10x less than similar services that offer inferior detection and less flexible settings. Cancel anytime without a penalty.

Detect Residential Proxies & Private VPNs

Even stealthy residential proxies can't escape IPQS detection methods. Our team has developed very intuitive solutions for isolating risky users that other services cannot detect. Easily identify residential proxies, botnets, and other types of infected computers that allow tunneled connections.

Flexible Settings & Pattern Recognition

Adjust a wealth of settings and manage custom rules to personalize scoring for your audience. This ensures that our scoring is the perfect fit for your user base. Additionally, custom machine learning algorithms continuously learn from your lookup history.

Support When You Need It

IPQS is always here for you. From integration assistance to optimizing your settings, our team is always available to support you, even on weekends. Once your account is active, you can submit a support ticket or contact our tech support hotline at any time.

What Makes Our Proxy Detection Service Different?

IPQS provides the most accurate proxy detection service in the industry. Through the use of proprietary honeypots & traps, blacklists, forensic analysis, and client feedback loops, we are able to detect compromised connections and risky users to a significantly higher degree than any other anti-fraud service. Score users beyond just the IP address for the best accuracy by passing additional data points such as device info, transaction info, and personal information (email address, physical address, phone number). IPQS also allows for the most flexible and customizable scoring settings to tailor the service to your audience. Never worry about false-positives again, IPQS detection will adapt perfectly to any site or app.

We welcome you to test our proxy detection solution as every user is awarded 5,000 free lookups per month and additional lookup queries are the most affordable in the industry. Easily connect to our tools like the VPN Detection API to detect any proxy IP address. Our goal is to help your website prevent fraud, increase ROI, & save you money at the same time! Detect malicious bot IPs and high risk behavior with ease. Coding examples and plugins make it easy to integrate our service in less than 5 minutes.

The Most Accurate Proxy Detection Service

Detect Proxies & VPNs with the Highest Degree of Accuracy and Precision

Real Time Scoring

Real-Time Scoring

easy integration

Easy Integration

proxies VPNs

Detect Proxies & VPNs

detect bots

Prevent & Block Bots

Leading IP Reputation Service

Take advantage of the internet's best IP reputation data to make intelligent decisions about your users, clicks, purchases, and similar user behavior. Receive accurate results worldwide in any region of the world. With full support for detecting bot traffic and malicious behavior, you can feel confident that IP addresses processed by IPQS proxy detection are reliable and accurate. Smart scoring avoids false-positives that can occur for IP ranges shared by multiple users and frequently recycled.

Fraud Scoring and Proactive Fraud Prevention

The fraud prevention industry has different approaches for dealing with malicious IPs. IPQS believes the best way to manage fraud is to completely prevent it from happening in the first place as this saves time and has a higher success rate in reducing overall fraud. Rather than review post-analysis reports or receive notifications after fraud has been committed, IPQualityScore can prevent fraud and high risk behavior in real-time. This approach allows you to block proxy and VPN connections and adjust scoring settings in real-time. Easy integration can offer complete ecommerce fraud protection or any other type of abuse by bad users.

All of our anti-fraud tools also return a real-time "fraud score" so that users with a fraud score in a high risk threshold are detected and blocked, flagged for review, or redirected away from critical parts of a site like a registration or payment page, comments section, click funnel, etc. This approach successfully results in fewer problems with managing users, clients, & advertisers. Let IPQS automate your quality control and greatly reduce time spent on cleaning up abuse such as manually detecting duplicate users, clearing user generated SPAM, and blocking high risk users.

IP Reputation Scores

IPQS Proxy Detection API can accept additional information to enhance the "fraud score" accuracy and improve detection for malicious IP addresses. We recommend passing the user agent (browser), user language, and additional details found on the user dashboard into each API request. These data points improve our ability to detect anonymous proxies, VPN providers, TOR exit node connections, and other types of proxy servers.

Full transaction info including billing, shipping, and credit card data can optionally be scored as well. This gives IPQS greater insight than just examining an IP address so we can give you the most accurate prediction of fraudulent behavior for each lookup. IPQS fraud scoring combined with the status of the lookup as a proxy connection, VPN connection, or Tor connection is a proven solution to preventing fraud and abuse.

Feed IP reputation data directly into your preferred security platform featuring our API and on-premise threat intelligence feeds.

Better Proxy & VPN Detection

With best-in-class features like our VPN detection API, stay on top of the latest threats by also detecting VPNs and TOR exit nodes in every corner of the world. Fresh data ensures you can detect VPNs even with newly assigned IP addresses. Identify private VPN networks used exclusively by abusive fraud rings and view VPN providers for any IP virtual private network (VPN) connection.

Data centers, hosting providers, and server IPs are also detected in the "connection type" parameter. Easily prevent VPNs from accessing your website or enable additional verification for risky IPs. View the full IP reputation API documentation for more details on specific data points included with each proxy detection result.

Confidently detect proxies, VPNs, tor exit nodes, and bad actors with the best IP intelligence service. Detect malicious IP addresses faster than any other service with greater insight and data quality.

1-click proxy detection plugins are available for popular ecommerce, CMS, SOAR, and firewall products to ensure a smooth integration process. Contact our support team if you need any assistance integrating our service with your platform.

Features and Benefits

  • Advanced Proxy Detection Service - Also Detect TOR & VPNs
  • 5,000 FREE Proxy Detection API Lookups Per Month
  • Accurately Detect Proxy Servers, Anonymous Proxies, & Tor Exit Nodes
  • Prevent Chargebacks, Duplicate Accounts, Click Fraud, & Fraudulent Users
  • Batch Process CSV Files & Lists
  • Manage Whitelist & Blacklist Rules
  • Detect Any Proxy IP Address & VPN Providers
  • Block Proxies, VPNs, Tor, Bots, & Other Malicious IP Addresses
  • Smart Fraud Scoring & Threat Blocking
  • Proxy Detection Results With Adjustable Quality Strictness
  • Easy Proxy Detection API Lookup with Documentation & Example Code
  • Reduce Fraud & Abuse for Registrations, Payments, Leads, etc.

Who Uses This Service?

  • Advertisers, Ad Networks, Affiliate Marketers, & Affiliate Programs
  • Online Retailers - Online Sales, E-commerce, & Sign Ups
  • Payment Processors, Merchants, & Financial Institutions
  • Lead Generation & Transactional Processing
  • Dating Networks, Social Platforms, & User Driven Content
  • Travel, Booking, Rental, & Ticketing Services
  • SaaS Service Providers
  • Fraud Monitoring, Compliance, & Security Systems
  • ... and any site with users or transactions
Proxy Detection Service
API Lookup Access

IP Reputation API Lookups

Threat & Abuse Network

Largest Threat & Abuse Network

Fraud Prevention Detection

Industry Leading Fraud Prevention

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