Primary Benchmark 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):
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 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 easy-to-read bar chart.
On-the-fly hierarchical sorting of performance results by cached (default) or uncached performance.
(Sorting is “hierarchical” because cached is sorted first, followed by uncached, then dotcom.)
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 result report for non-graphical detailed reporting.
Full detailed, locale-aware (internationalized), CSV results export.
Automatic logging to CSV file for long-term background results monitoring and collection.
Simultaneously compares the performance and reliability of up to 200 DNS nameservers.
Determines nameserver network name (reverse DNS), ownership, operational status.
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.

Additional Power-User & Convenience Features:
The built-in top-50 domains list is user-replaceable to allow more or less accurate (and statistically significant) operation, and for support of DNSSEC record authentication. (More domains takes longer to run.)
.INI files containing sets and subsets of nameservers to benchmark can be added, removed, and saved.
Special “dnsbench.ini” 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 startup, 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.