Armin Šupuk

Software engineer and entrepreneur

Software

Security software from Armin Šupuk, the researcher who discovered Android's NAT-T keepalive VPN lockdown bypass. VPN Leak Guard detects and mitigates this fixed-signal exposure on supported devices and physical transports. To purchase a license, visit the payment portal. Already purchased? Use the license recovery form with the payment identifier shown on your purchase receipt to retrieve the license key attached to that order.

  1. VPN Leak Guard

    v2.1.10

    VPN Leak Guard is Android security software by Armin Šupuk, the researcher who discovered the Android NAT-T keepalive VPN lockdown bypass. All Real IP, NAT-T, and QUIC analysis checks are free. Its on-demand Real IP check shows the public address seen by an Internet server. A lifetime license enables NAT-T protection through keepalive-slot reservation on supported physical transports and provides clear warnings and status guidance. Optional, consent-based research reporting helps map affected device and transport combinations. The mitigation covers this fixed NAT-T keepalive signal—not arbitrary traffic—and results remain device-dependent because keepalive slots and offload behavior vary by hardware, Android build, and transport. Read the technical disclosure.

    Package
    ch.supuk.vpnleakguard
    Author
    Armin Šupuk
    License
    Proprietary
    Analysis
    All Real IP, NAT-T, and QUIC analysis checks are free
    Protection
    Lifetime license enables NAT-T protection through keepalive-slot reservation
    Price
    €14.99 excl. tax
    Activation limit
    3 active protected devices per license

    Analysis is free. NAT-T protection requires a paid lifetime license. Review the Software License Terms and the Privacy Policy before purchase.

    Free analysis · Paid protection

    Get VPN Leak Guard

    Install VPN Leak Guard to run all analysis checks for free. A lifetime license is required only for NAT-T keepalive slot reservation.

    Free analysis

    Install VPN Leak Guard and run every analysis without a license.

    Get it on Obtainium
    Update notifications
    Direct download APK
    Manual installation

    Paid protection

    Reserve NAT-T keepalive slots on up to three active devices with a lifetime license.

    Lifetime license

    If you like this app, recommend it to others and earn a 30% commission on qualifying purchases. Join the affiliate program.

    • VPN Leak Guard overview with an on-demand Real IP check, a protected NAT-T result, and a vulnerable QUIC result.
    • VPN Leak Guard NAT-T keepalive detail screen showing a protected result.
    • VPN Leak Guard QUIC connection-close payload detail screen showing a protected result.
    • VPN Leak Guard overview showing a completed Swiss IPv4 result with protected NAT-T and QUIC checks.
    • VPN Leak Guard license screen showing an active lifetime license.
    • VPN Leak Guard NAT-T keepalive slot details showing active hardware offload and a 24-hour 32-minute lease uptime.
    • VPN Leak Guard feature card showing a completed one-shot Real IP and offline country result.
    • VPN Leak Guard feature card explaining protection of the known NAT-T path across supported physical transports while protection runs.
    • VPN Leak Guard feature card presenting the Real IP, NAT-T keepalive, and QUIC connection-close checks in one overview.
    • VPN Leak Guard feature card explaining the QUIC connection-close payload exposure check.
    • VPN Leak Guard feature card explaining a lifetime license for up to three active devices.