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Educational and ethical use only. Only test systems you own or are explicitly authorized to test. Full disclaimer.

DNS leak test

Tests whether DNS queries are leaking outside a VPN tunnel by checking which DNS servers resolve your lookups, potentially exposing your ISP.

opsec
Official docs ↗

Platforms: Web · Last verified October 1, 2026

Tests whether DNS queries are leaking outside a VPN tunnel by checking which DNS servers resolve your lookups, potentially exposing your ISP.

Only use this tool against systems you own or are explicitly authorized to test — see the disclaimer.

Getting started

Best for: Verifying DNS query routing through VPN, detecting ISP DNS exposure. See the official site linked above for details.