Identify proxy and VPN usage with IP analysis

VPNs (Virtual Private Networks) and proxies (web proxy servers) are popular tools for users to protect their privacy, access restricted content or hide their online activities. However, they are also often used by fraudsters and cybercriminals to mask their identity and commit nefarious activities. For this reason, it is critical that websites detect the use of proxies and VPNs effectively to mitigate risks such as website attacks, hacking, data breaches and fraudulent transactions.

Identify proxy and VPN usage with IP analysis or proxy is possible by using various techniques that include analysing DNS requests, analysing protocol metadata and comparing timezone differences between the browser timezone settings reported by the user’s web browser with the IP address geolocation. These types of discrepancies are a strong indicator that the user is hiding their true location with a VPN or proxy service.

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Another technique involves comparing the IP address of the connecting device with known database lists of proxies and VPNs, as well as identifying IPs that are associated with data centres. Some services like ScreenlyyID enable businesses to cross-reference an IP address with databases of known VPN and proxy IP ranges to identify suspicious users. This type of identification can help businesses to reduce risk, improve compliance and enhance security and content filtering. This is also a crucial tool for ad tech companies to reduce click fraud and optimize ad delivery, while maintaining the integrity of user data.

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Whether you use a identify VPN connection for work or pleasure, chances are you’ve used it to protect your privacy online. And while VPN connections are often used for good — including accessing a corporate network, anonymous browsing and protecting your online privacy— cybercriminals also abuse these networks to engage in click fraud, credit card chargebacks and other bad activities.

So how can you identify a VPN connection? The easiest way is with an IP address lookup tool, which details a person’s location. If a person’s IP address changes quickly, it suggests that they are using a VPN.

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Another method involves analyzing the type of encryption and tunneling protocols a VPN uses to protect its data packets. Known VPN protocol types include OpenVPN, PPTP and L2TP. Using tools such as Netstat or Wireshark can identify traffic patterns that suggest the presence of VPN use.

A service provider can also recognize VPN use by tracking the amount of data a user generates on their device. A VPN server typically sees a high volume of data, while a home IP address will generally generate much less.