It depends on the implementation of the resolver, but in general when no information is known about a nameserver, the resolver will pick one at random. Overtime

It depends on the implementation of the resolver, but in general when no information is known about a nameserver, the resolver will pick one at random. Overtime, it'll keep track of the latency and pick one (usually randomly within a band specifying a range of latencies). See this paper for more info: https://www.dns-oarc.net/files/workshop-201203/OARC-workshop-London-2012-NS-selection.pdf https://www.dns-oarc.net/files/workshop-201203/OARC-workshop...