How to Detect VPNs and Proxy Servers With PHP

How to Detect VPNs and Proxy Servers With PHP

While some users utilize detect VPNs and proxies with PHP others conduct nefarious activities like account takeovers and credit card fraud on websites. For these reasons, detecting VPNs and proxies with PHP is an essential task for developers and webmasters alike. In this article, we will show you how to quickly and easily evaluate an IP address with PHP for proxies or VPN connections.

Detecting VPNs and proxies is challenging for many reasons, the most notable being that users’ digital footprint is hidden. To combat this, a variety of methods exist for identifying the use of VPNs and proxies with PHP. Some of the most popular methods involve examining DNS queries. By implementing DNS-based detection, it is possible to identify VPNs and proxies by recognizing their unique DNS server configuration.

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Another commonly used method involves comparing the timezone reported by the user’s browser with the geolocation of their IP address. This approach capitalizes on the fact that users who are behind VPNs or proxies are likely to experience timezone discrepancies between their device’s timezone settings and their IP geolocation. This method can produce false positives when users manually adjust their timezone settings or use browser extensions, but it is a good complement to other VPN detection techniques.

Performing port scans is another simple technique for detecting proxies with PHP, although it can trigger false positives when users who operate web cameras or game servers may legitimately have open ports on their devices. Lastly, the creation and maintenance of a blacklist of common proxy server IP addresses can be an effective way to block VPN and proxy usage. However, these methods can be difficult to maintain and need to be combined with other VPN detection methods to minimize false negatives.