Free browser-based privacy audit — no install needed Is Your ISP Spying on You? Test for supercookies, header injection, DNS hijacking, and TLS interception — in seconds, from your browser. 🚀 Run Free Test No sign-up. No install. 100% client-side checks. What We Check Four independent checks. One privacy score. 🔍 Header Injection Detect UIDH supercookies, UID headers, and ISP-injected tracking tags. 🌐 DNS Privacy Is your DNS encrypted? Resolver fingerprinting reveals who handles your queries. 🔒 TLS Integrity Detect middleboxes silently intercepting your encrypted traffic. 📊 ISP Reputation See how your provider stacks up in our real-user leaderboard. Real Score Examples 92 /100 Cloudflare WARP Low Risk Encrypted DNS + clean headers 58 /100 Comcast Xfinity Medium Risk ISP DNS resolver detected 21 /100 Verizon Wireless High Risk UIDH supercookie found Frequently Asked Questions Does this store my IP address? ▾ Never. Your IP is hashed with a daily-rotating salt before storage. We cannot reverse it. How long does the test take? ▾ About 5–10 seconds. All checks run directly in your browser. What is a supercookie / UIDH? ▾ Verizon and some ISPs inject a unique identifier into HTTP requests that advertisers can read — even in private browsing mode. Will a VPN fix my score? ▾ Yes — a VPN encrypts all traffic before it reaches your ISP, preventing header injection and DNS surveillance. Ready to find out? Your ISP score takes 10 seconds to calculate. 🔍 Check My ISP Score