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Domain Name Servers (DNS) are the servers for providing service of domain name mapping to IP address. They maintain a directory of domain names and translate them to IP addresses. As we know domain names are easy for people to remember but computers or machines access websites with IP addresses.
This test will list DNS records for a domain in priority order. The DNS lookup is done directly against the domain's authoritative name server. If domain name server is responding fast then it will add no overhead delay.