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Last update; 17 August 2010:

Are your DNS nameservers impeding your Internet experience? A unique, comprehensive, accurate and free Windows (and Linux/Wine) utility to determine the exact performance of local and remote DNS nameservers . . .

You can't optimize it until you can measure it. Now you CAN measure it!

Features

• Compatible with all versions of Windows from Windows 95 through Windows 7.
• Compatible with Wine (Windows emulation) running on Linux and Macintosh.
• Hand-coded in 100% pure assembly language for highest precision and smallest size: 154 KBytes.
• Installation-free — nothing to install — just run the small executable file. (Won't change anything or mess up your system.)
• Lightweight (single packet), optional automatic and/or manual version checking.
• Task Scheduler-compatible for non-UI non-interactive background operation.
• Optional, automatic results logging for fully unattended operation.
• Comprehensive error return codes to support full automation.
• 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):
• Cached lookups – the time to return a domain name that is already in the resolver's name cache.
• Uncached lookups – the time to return a sub-domain name that is not already in the resolver's name cache.
• Dotcom lookups – the time to consult the nameserver's chosen dotcom resolver(s) for a dotcom name.
• Reliability – the number of queries not replied to (lost) during the benchmark.
• 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.
• 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.
• The built-in top-50 domains list is user-replaceable to allow more/less statistical significance, and for support of DNSSEC record authentication.
• .INI files containing sets and subsets of nameservers to benchmark can be added, removed, and saved.
• Special “dnsbench.ini” file is auto-loaded, if present, to always override built-in nameserver list.
• (This supports the use of customizable personal nameserver lists for special applications.)
• At start-up, tests for the presence of, and deliberately “triggers”, any outbound-blocking personal firewalls to allow Internet access exceptions to be provided before testing begins.
• Internet connectivity aware – verifies unimpeded Internet connectivity before testing and gracefully handles possible loss of Internet connectivity during testing.
• Bar chart results can be copied to the system clipboard or saved in BMP or compressed PNG format for storage or sharing.
• Built-in self-screen capture to BMP or compressed PNG file.
• All benchmark pages and tabs can be copied to the system clipboard or saved to files as text, rich-text, or images as appropriate.