namebench is described as 'Are you a power-user with 5 minutes to spare? Do you want a faster internet experience?' and is a Benchmark tool in the os & utilities category. There are five alternatives to namebench for Windows, Homebrew and Mac. The best namebench alternative is Dns Jumper, which is free. Other great apps like namebench are DNS Benchmark, DNS Easy Switcher, DNS Hop and Family Friendly DNS.
DNS Jumper is capable of modifying your DNS server address based on the types of network cards you have and the types of DNS services you select. After you select your network card and preferred DNS services, you can surf the internet using that particular DNS setup.
GRCs DNS Benchmark performs a detailed analysis and comparison of the operational performance and reliability of any DNS nameservers at once.
A simple macOS menu bar app that allows you to quickly switch between different DNS providers (or add custom ones).
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although it's discontinued, it is functional and stable enough to offer you the fastest dns benchmark test available.