There are several others who keep an eye on the list of DNS tools.
They take an old workstation and set it up to run the queries on the customer’s side of the resolvers. I’ve seen several big SPs use this tool in their NOC to monitor the DNS resolver clusters.
REDDIT HOMENETWORKING LAN SPEED TEST WINDOWS
GRC provides the Windows community (and Linux/Wine) with a DNS Resolution testing utility to determine the exact performance of the DNS Resolver and the DNS Authoritative chain. The following are tools that can be used to monitor, test, and troubleshoot DNS latency through DNS Resolvers Architectures and DNS Authoritative Architectures. This DNS Latency and Performance Test Tools document is provided to help Operators and others deploy effective DNS Resolver (rDNS), DNS Authoritative (aDNS), and other DNS Architectures. DNS Latency is the #1 “Key Performance Indicator” (KPI) for a DNS system’s success.