You could have downloaded DNS Performance Test 0.8 for Mac from our software library for free. The program belongs to System Tools.
From the developer:
DNS Performance Test can test the performance of your dns server and show the results in a handy chart. It will resolve the ip addresses in random order of the included list of 10,000 domain names inside the domains.txt file. You can edit this file if you wish to test different domains.
You may want to check out more Mac applications, such as DNS Flusher, DNS Enabler or DNS, which might be similar to DNS Performance Test.
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