About DNSSpeedTester™ — Free DNS Benchmarking Tool

DNSSpeedTester™ is a free, open-source DNS benchmarking and speed testing utility built by the team behind OpenSpeedTest, a trusted network performance suite running continuously since 2013 and used by millions of network engineers, ISPs, and home users worldwide.

Every web request begins with a DNS lookup. If your DNS resolver is slow or poorly routed, you will experience a lag before web pages, apps, or streaming services even begin to load. DNSSpeedTester™ allows you to compare the latency and reliability of major public DNS providers in real-time, helping you identify and switch to the fastest DNS server for your specific internet connection.

Comprehensive Features of the Web Application

Our web application lets you benchmark DNS resolvers directly in your browser with zero installation or setup. Key features include:

DNS Provider Categories: Quickly test and compare DNS resolvers grouped by category, including Default (Popular), Privacy First, Security First, Family & Ad-Block, Regional, and Custom.
Flexible Protocol Support: Measure latency using DNS-over-HTTPS (DoH) protocols directly from your browser.
Customizable Latency Metrics: Go beyond simple averages. Rank your results using Optimized Average (Fastest 50% - default), Median (p50), 95th Percentile (p95), 99th Percentile (p99), or Simple Mean.
Cache-Busting Technology: Force resolvers to perform recursive lookups rather than serving cached results by prepending random subdomains to query domains, simulating real-world cold latency.
Concurrency Control: Adjust the limit of parallel queries to benchmark DNS performance under varied load conditions.
Custom Test Domains: Add your own target domains to customize which websites are resolved during the benchmark.
DNS Provider Manager: Create, edit, and delete DNS servers with custom IPv4/IPv6 addresses, groups, and DoH endpoints.
Configuration Portability: Import and export your configured DNS servers and settings using JSON files.

Advanced Features in Our Native Apps

For users seeking deeper integration, we offer native applications for Windows, macOS, Linux, iOS, and Android. The native apps offer unique advantages over browser-based testing:

Bypass Browser Limitations: Native apps operate outside the browser sandbox, completely avoiding CORS policies and request overhead for maximum timing accuracy.
Full Protocol Benchmarking: Test resolvers using raw UDP, DNS-over-TLS (DoT), DNS-over-HTTPS (DoH), and raw ICMP Ping.
Automatic Local Resolver Detection: The native apps automatically detect and benchmark the DNS servers currently configured on your host operating system.
Lower Network Overhead: Direct network interface access ensures minimal latency overhead, providing consistent benchmarks.

No Installation. No Account. No Data Collected.

Simply run the test. DNSSpeedTester™ works natively across all platforms without asking for personal information, logins, or storing your benchmark results on our servers. Your network privacy and performance are our only priorities.

Fully Open Source and Self-Hostable

The entire ecosystem, from the frontend benchmark engine to the server tools, is open source and available on GitHub. You can deploy your own private DNS testing node on a local network or cloud infrastructure using our multi-architecture Docker images (supporting amd64, arm64, and arm/v7).

Ready to host a private endpoint? Head over to our Apps & Self-Hosted page to get started.

Built on Over a Decade of Network Testing

Since 2013, OpenSpeedTest has set the standard for lightweight, dependency-free network diagnostics. DNSSpeedTester™ carries forward this legacy by providing clear, accurate, and completely free tools to optimize your internet experience.

Questions, feedback, or integration ideas? Feel free to Contact us or contribute directly to our GitHub repository.

Test Your DNS Now

Find the fastest resolver for your network. Run the DNS Speed Test now.