DNS Speed Tester

About

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.