GRC's DNS Benchmark performs a detailed analysis and comparison of the operational performance and reliability of any set of up to 200 DNS nameservers (sometimes also called resolvers) at once. When the Benchmark is started in its default configuration, it identifies all DNS nameservers the user's system is currently configured to use and adds them to its built-in list of publicly available “alternative” nameservers. Each DNS nameserver in the benchmark list is carefully “characterized” to determine its suitability — to you — for your use as a DNS resolver. This characterization includes testing each nameserver for its “redirection” behavior: whether it returns an error for a bad domain request, or redirects a user's web browser to a commercial marketing-oriented page. While such behavior may be acceptable to some users, others may find this objectionable.
Once the benchmark finishes, the results are heuristically and statistically analyzed to present a comprehensive yet simplified and understandable English-language summary of all important findings and conclusions. Based upon these results, users may choose to change the usage order of their system's own resolvers, or, if alternative public nameservers offer superior performance or features compared with the nameservers currently being used, to switch to one or more alternative nameservers.
Website:
GRC's | Home Page
Features:
- For each of up to 200 DNS nameservers, using the Internet's most popular top-50 domain names, independently measures, charts, statistically analyzes, reports (and optionally exports):
- o Cached lookups – the time to return a domain name that is already in the resolver's name cache.
- o Uncached lookups – the time to return a sub-domain name that is not already in the resolver's name cache.
- o Dotcom lookups – the time to consult the nameserver's chosen dotcom resolver(s) for a dotcom name.
- o Reliability – the number of queries not replied to (lost) during the benchmark.
- o Rebinding protection – whether the resolver blocks non-routable private IP addresses.
- Optionally verifies whether nameservers provide DNS security (DNSSEC) record authentication.
- When using a list of (provided) DNSSEC-signed domains, benchmarks DNSSEC authentication performance.
- Graphs and compares all four benchmark parameters with an easy-to-read bar chart.
- Builds a customized list of the fastest performing (for you) top 50 resolvers, located anywhere in the world, selected from a master list of more than 4,800 possible known resolvers.
- On-the-fly hierarchical sorting of performance results by cached (default) or uncached performance.
- (Sorting is “hierarchical” because cached (or uncached) performance is sorted first, followed by uncached (or cached), then by dotcom last.
- Auto-scaled bar chart that can be manually overridden for chart-to-chart comparison.
- Pop-up value “inspector” (left click in nameserver list) displays precise values on bar chart.
- Detailed tabular results report.
- Fully detailed, locale-aware (internationalized), CSV results export.
- Automatic logging to a CSV file for long-term background results monitoring and collection.
- Simultaneously compares the performance and reliability of up to 200 DNS nameservers.
- Determines network name (reverse DNS), ownership, and operational status for each nameserver.
- Determines whether nameservers intercept and redirect bad domain names.
- Comprehensive, heuristic “Conclusions” generation summarizes all results and suggests useful system changes, if any, in easily readable English.
- All results are analyzed for statistical significance with a 95% confidence threshold.
- Bottom of tabular data page contains built-in quick-reference “reminder” help.
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