Network Overview
Your network status at a glance
DNS & Network Check
Detect your IP, DNS resolvers, and network configuration
Your IP Address
detecting...DNS Resolver
detecting...Checking your DNS configuration...
DNS Security
pending...Evaluating DNS security features...
DNS Lookup
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Connection History
Track your network performance over time
30-Day Download Speed
Speed Test
Measure your connection speed via Cloudflare's global edge network
Waiting to start
Click the button below to begin
History
No previous tests recorded
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Ad Block Tester
Test the effectiveness of your ad blocker across multiple categories
Detected Filter Lists
Identifying which filter lists your ad blocker uses...
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Security Headers
Analyze HTTP security headers of any website
Check URL
Security Grade
—About Security Headers
Security headers protect against common web attacks like XSS, clickjacking, and MIME sniffing. A higher score means better protection for visitors.
Header Analysis
TLS Inspector
Analyze your TLS connection and security headers
Click the button above to check your TLS connection.
Browser Fingerprint
See what your browser reveals about you. No data leaves your device.
Connection Quality
Analyze your network connection, TLS security, and stability
Quality Score
Connection Type
Run the test to see your connection details.
TLS Details
Run the test to see TLS information.
Request Timing
Run the test to see request timing breakdown.
Connection Stability
Run a stability test to measure jitter and packet loss over 30 seconds.
Network Map
Measure latency to global regions
About NetCheck
Local diagnostics for your network connection and browser security.
Detects your IP address, DNS resolver configuration, and checks DNS security features such as DNSSEC validation, DoH encryption, and malware filtering. Includes a DNS lookup tool to query domains for any record type.
Measures download and upload speed, latency, jitter, and bufferbloat using your nearest Cloudflare edge server. Displays real-time performance graphs, a 5-factor quality grade, and keeps a persistent history of your last results.
Checks how well your ad blocker or browser is blocking ad scripts, trackers, analytics, social media widgets, and fingerprinting scripts. Gives a score from 0 to 100 with category-specific recommendations.
Scans any website for 10 critical security headers: HSTS, CSP, X-Frame-Options, Referrer-Policy, and more. Provides a letter grade, detailed per-header analysis, and suggests improvements.
Analyzes how unique your browser fingerprint is across 6 categories: Canvas, WebGL, Audio, Fonts, Screen, and Navigator properties. Provides tailored privacy protection tips to reduce your online trackability.
Inspects your browser connection info (type, downlink, RTT), TLS details, request timing breakdown (DNS / TCP / TLS / TTFB / Download), and runs a stability test measuring jitter and packet loss over 30 pings. Computes an overall A+–F grade.
Measures your latency to global network endpoints, giving a regional view of connection health. Visualizes closest regions, quality ratings, and server relay latency via Cloudflare’s distributed edge.