This paper provides the first systematic study of DNS data taken from one of the 13 servers for the
registry. DNS’ generic Top Level Domains (gTLDs) such
serve resolvers from throughout the Internet and respond to billions of DNS queries every day. This study uses gTLD data to characterize the DNS resolver population and profile DNS query types. The results show a small and relatively stable set of resolvers (i.e. the
) constitute 90% of the overall traffic. The results provide a basis for understanding for this critical Internet service, insights on typical resolver behaviors and the use of IPv6 in DNS, and provides a foundation for further study of DNS behavior.